90 Degree Rule

This pool shooting tutorial illustrates the 90 degree rule, which states that when the cue ball hits the object ball straight, the two balls will separate at 90 degrees. This is true regardless of the "cut angle," or angle the balls are apart from each other. Use the 90 degree ...more

This video shows how to check for and prevent a scratch in pool by utilizing the 90 degree rule and sending the object ball into the correct pocket. Two techniques shown to are "follow" and "draw," hitting the cue ball above or below the center. Prevent a scratch in pool using ...more

This video illustrates how to use your own hand to help visualize the 90 degree rule when shooting pool and determine where the cue ball and the object ball will go, so you don't scratch. The thumb and forefinger spread out in an "L" shape will effectively predict the directio ...more

Similar to the 90 degree rule, the 30 degree rule is demonstrated in this video. Your two forefingers in a V-shape are the best tools to use for visualizing this angle.

This video tutorial shows you how to build a retaining wall system with an outside 90 degree wall. This how-to video is a must-watch for everyone in the building and construction business.

This video tutorial shows you how to build a retaining wall system with another wall inside it at a 90 degree angle. This video is a must-watch for eveyone in the construction business.

This is another example of the 30 degree rule when shooting pool. It shows that the anticipated and actual paths of both balls are the same. With a solid knowledge of the 30 degree rule, you can accurately predict where the cue ball will go and set up you next shot. Use the 30 ...more

This video illustrates an example of using the 30 degree rule and the path the cue ball will take. It shows the anticipated path when the ball is hit with medium speed, and it demonstrates the curve effect when the ball is hit hard. Use the 30 degree rule to determine cue ball ...more

Learn how to perform a 90 degree turn in order to increase ball control when playing soccer.

Also known as the Line of Action, the 180 Degree Rule is an important fundamental to communicating the action through careful camera positioning. Jennifer O'Rourke walks us through it.

Budding cinematographer? Avoid a common rookie mistake with this video guide, which demonstrates what directors of photography know as the "180° rule," which requires that subjects maintain the same left-right relationship to one another in the same scene. For a comprehensive ...more

Learn how to perform a 90 degree turn with your car like a real getaway driver! Watch out! This drifting move should be practiced on the track or a very large parking lot.

This video demonstrates good technique for planning and executing a pool shot, beginning with the 90 degree rule or the 30 degree rule. First visualize the aiming and impact lines, then the tangent line where the cue ball will go. Decide how fast to shoot depending on how far ...more

By using the 90 degree rule when shooting pool you can make the cue ball follow along a tangent line to determine perfectly where the ball will go and prevent scratch. The cue ball follows the path of the object ball and is deflected off the rail setting up the next shot. Prev ...more

In a special case of the 90 degree rule where there is no cut angle, the cue ball will transfer its speed to the object ball on impact. The cue ball will push the object ball into the pocket, but stop before falling in itself. This is known as a "stop shot" or "stun shot". Mak ...more

This is a quick demonstration of the "stun" shot. This shot uses the 90 degree rule to pocket the object ball when it isn't lined up with the pocket and predict the path of the cue ball. Make a stun shot. Click through to watch this video on colostate.edu

This video show how to use the 90 degree rule to plan an "object ball carom shot." This type of shot will deflect the object ball off 2 balls before making it into the pocket. An object ball carom shot requires a decent knowledge of geometry. Make an object ball carom shot. Cl ...more

Learn how to do leg swings. Presented by Real Jock Gay Fitness Health & Life. Benefits This classic floor exercise gives a tough workout to your abdominal muscles, with a particular focus on your lower abs. It's also a great "no excuses" exercise, meaning you can do it just a ...more

Learn how to do speed leg swings. Presented by Real Jock Gay Fitness Health & Life. Benefits This classic floor exercise gives a tough workout to your abdominal muscles, with a particular focus on your lower abs. For this variation, you'll focus on controlled speed and power ...more

This is part one of two in how to make a beautiful tree of life pendant. It is very easy, and you'll only need a few items. Things you'll need: wire 2-3 mm thick, Round nose pliers, 4 pieces of thin wire, 12 inches long, wire cutters. With your round nose pliers, bend the thic ...more

Learn how to do dumbbell regular 21 curls to preacher curls. Presented by Real Jock Gay Fitness Health & Life. Benefits Bicep curls shouldn't always go from hip to shoulder; using half of your range of motion demands greater control within your muscles' working range of motion ...more

Learn how to do flat bench dumbbell power press drop set. Presented by Real Jock Gay Fitness Health & Life. Benefits Combine the difficulty of a drop set with the challenge of adding speed and power to each dumbbell press for a killer chest workout. Muscles Worked Chest Starti ...more

Learn how to do dumbbell 21 curls. Presented by Real Jock Gay Fitness Health & Life. Benefits Use three ranges of curling motion—lower half only, upper half only and full range of motion. Select a weight a little less than the normal weight you would use when doing curls for ...more

Learn how to do dumbbell up rotator on a spin bike. Presented by Real Jock Gay Fitness Health & Life. Benefits The dumbbell upward rotator helps warm up and strengthen the rotator cuff muscles. Do this exercise with light weights to loosen them up and help minimize the risk o ...more

Learn how to do dumbbell straight-leg deadlift and dumbbell rows. Presented by Real Jock Gay Fitness Health & Life. Benefits The dumbbell straight leg dead lift and dead row combines these two challenging exercises into a tough workout for your leg and back muscles. Muscles W ...more

Learn how to do dumbbell chest press incline reduction (incline to decline). Presented by Real Jock Gay Fitness Health & Life. Benefits These monster sets of chest presses will work your pecs from top to bottom, and then bottom to top. Use the adjustable incline bench for a ci ...more

Tutting is a popular type of popping focused on 90 degree hand movements inspired by depictions of King Tut. This video will show you how to do one very cool tutting combo step-by-step, giving you another piece that you can use to build your tutting routines and kill the dance ...more

Diagonal lashings are a popular type of knot for building structures with wooden poles that allows you to join two poles at a 45-90 degree angle. It can replace a square lashing, but not vice versa. This video will show you how to tie a diagonal lashing yourself, which can be ...more

A 3RUN tutorial for the Cartwheel Arabian move. This trick tutorial is performed by Chase Armitage and produced by 3RUN Media. You need to be able to do a roundoff backflip. This is a roundoff backflip with a 90 degree turn. This is a parkour, freerunning or gymnastics techniq ...more

A Ford Puma is used to instruct some cool moves. Learn the handbrake turn, 90 degree turn, reverse flip, Scandinavian flick with liftoff oversteer (similar to power slides). It's like drifting.

Want a great, inexpensive, 3D movie experience in your bedroom (and have an aversion to the perennial red/blue anaglyphic glasses)? Sean Hellfritsch from Encyclopedia Pictura shows how to make the Vizard, a home 3-D viewing station. This podcast from Wired Magazine is a creati ...more

In this video tutorial, viewers learn how to do a double leg free-run trick. This trick is similar to the side flip, except the side flip needs the legs to be tucked in while the double flip needs the feet to be kept straight. The double leg is at a 90 degree angle in mid-air. ...more

Component 1. Frame And Posture. The benefits of dance shoes never outweigh the benefits of proper spin technique. Your body should be straight lower abs and stomach should be tight. Your arms are in proper position. If you lift your hand it should be in 90 degree angle. Comp ...more

Watch this video tutorial from the Polish Guy to see how to clean and polish a headlight using Autosol Polish. In this polishing tip we clean a headlight from a Ford F150 using Autosol metal polish. The video includes polishing instructions for cleaning a car or truck headligh ...more

BMX: Catch Some Air If Ernest Michaux, inventor of the modern bicycle, could see what people are doing with his creation, he'd freak out. The art of creative biking has never been more challenging and rewarding than it is now. Check out the tricks for a guide to BMX mayhem. W ...more

Snowboarding: Hit the Slopes With Style There was a time when simply riding a snowboard made you the extreme guy on the slopes. But now, with more people strapping on a board instead of skis, the stakes have been raised. Fortunately, we've lined up this video tutorial to keep ...more

Learn how to do speed tricep dips on a Gravitron. Presented by Real Jock Gay Fitness Health & Life. enefits Tricep dips are one of the oldest and greatest tricep-building exercises in the book. Doing them on the Gravitron machine allows you to take a percentage of your body w ...more

Learn how to do hanging leg raises. Presented by Real Jock Gay Fitness Health & Life. Benefits Hanging leg raises isolate and work your lower abs mercilessly. Focus on form to keep the work down low where it belongs. Muscles Worked Abdominals (lower) Starting Position Posit ...more

Learn how to do lower back extensions. Presented by Real Jock Gay Fitness Health & Life. Benefits This exercise isolates and strengthens the often-neglected lower back muscles. Muscles Worked Lower back Starting Position Lie face downward on the back extension machine. Your ...more

Learn how to do a cable triceps press down drop set. Presented by Real Jock Gay Fitness Health & Life. Benefits If you've done the cable tricep bar press-down before, you know that it's a staple exercise of many workout programs that isolates and builds the muscles of the tri ...more

Learn how to do plyometric clap push ups. Presented by Real Jock Gay Fitness Health & Life. Benefits Plyometric push-ups are a great exercise for training power through your upper body. By adding a clap in the air at the top of your push-up, you develop a height goal for the ...more

Learn how to do close grip push ups. Presented by Real Jock Gay Fitness Health & Life. Benefits Push-ups are a great exercise because they work the entire chest and triceps while also training coordination and stamina. The close-grip variation of the standard push-up puts the ...more

Learn how to do proper push ups. Presented by Real Jock Gay Fitness Health & Life. Benefits Good trainers love push-ups because they work the entire chest and triceps while also training coordination and stamina. Best of all, push-ups can be done just about anywhere. Push-ups ...more

Learn how to do floor leg raises. Presented by Real Jock Gay Fitness Health & Life. Benefits You don't see leg raises done as much as crunches at many gyms. Why? Because they're hard, that's why! The floor leg raise is one of the great abs exercises, isolating the lower abs i ...more

Learn how to do stability ball hammer dumbbell curls. Presented by Real Jock Gay Fitness Health & Life. Benefits Hammer curls are tough to begin with, but doing them while balancing in a modified squat against a stability ball engages your whole body in a battle for stability ...more

Learn how to do stability ball push-ups and knee tucks. Presented by Real Jock Gay Fitness Health & Life. Benefits The stability ball push-up and knee tucks is a two-in-one workout that focuses on your chest and abs while simultaneously improving overall core muscle strength, ...more

Learn how to do stability ball dumbbell skull crushers. Presented by Real Jock Gay Fitness Health & Life. Benefits Don't let the name scare you away from this tried-and-true triceps builder. Proper focus on technique and use of appropriate weights will keep you from bonking y ...more

Learn how to do face down dumbbell rotate and press on an incline bench. Presented by Real Jock Gay Fitness Health & Life. Benefits Building your shoulders without strengthening your rotators is an invitation to injury. This exercise helps you warm up and strengthen the entire ...more

Learn how to do dumbbell skull crushers. Presented by Real Jock Gay Fitness Health & Life. Benefits Skull crushers are a deceptively simple triceps exercise. You work the triceps by moving the lower arm—but you also have to stabilize your upper arm, making the exercise more o ...more

Learn how to do twisting dumbbell incline chest presses. Presented by Real Jock Gay Fitness Health & Life. Benefits Twisting dumbbell incline chest presses work the muscles of your chest and upper back. Muscles Worked Chest, Back (upper) Starting Position Choose two dumbbel ...more

Learn how to do POP push-ups and sculpt your body without weights. Presented by Real Jock Gay Fitness Health & Life. Benefits POP push-ups combine the many benefits of the standard push-up with power, speed, and control training. To do POP push-ups, you'll blast up out of a d ...more

Learn how to do flat bench leg lifts. Presented by Real Jock Gay Fitness Health & Life. Benefits Looking for a excellent way to flatten and strengthen the lower abdominal muscles? The flat bench leg lifts hits the lower abdominals directly for an excellent isolated workout. M ...more

Tyson Mao is a renowned world competitor in solving the Rubik's Cube. Not only did this Californian become a world class solver, but he also formed the Rubik's Cube Association with fellow speed solver Ron van Bruchem, which holds competitive events for the Rubik's Cube. If yo ...more

Learn how to use a heavy boxing bag to do squat thrust push ups with power double punches. Presented by Real Jock Gay Fitness Health & Life. Benefits The squat thrust push-up develops explosive leg power plus chest and shoulder strength. The power double punch is a straight sh ...more

Learn how to do a Gravitron triceps dips drop set. Presented by Real Jock Gay Fitness Health & Life. Benefits Tricep dips are one of the oldest and greatest tricep-building exercises in the book. Doing them on the Gravitron machine allows you to take a percentage of your body ...more