The extent of the exercise is sitting down and extending your leg with a certain amount of resistance.Alpha Fuel 720 Squats with free weight barbells can be a great exercise if your goal is to sculpt various muscles in your body. Squats are one of the best muscle building activities because they work out 5 major muscle groups at the same time.Alpha Fuel 720 Never focus on one side of your body or just one area of muscles. …