![]() ![]() ![]() Other exercise equipment that provides isotonic exercise includes resistance bands, body weight calisthenics and weight machines. While flexion and extension describe the movement of the muscles during isotonic exercise, weights provide the equal resistance throughout the range of motion. Bench presses flex chest muscles as you raise the weight, and extend them as you lower it.Performing a biceps curl first flexes the biceps as you raise the weight, and then extends them as you lower it.Performing crunches flexes your abdominal muscles, while performing dead lifts extends your erector spinae. ![]() Examples of flexion and extension include: Flexion and extension involve pushing, pulling, lifting and lowering. When you change the length of your muscle, you flex and extend a muscle group.
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