We have three different muscle contractions with exercise and they are concentric where the muscle shortens, eccentric where the muscle lengthens and isometric where you are in a fixed position . When you think of a biceps curl, you are having an eccentric movement when you lift the dumbbell while squeezing the biceps and then eccentric when you lengthen and lengthen the head of the biceps as you extend the arm, however there is an isometric movement when you maintain the contraction, and it's the strongest eccentric movement in the point because you don't have momentum on your side you're going against everything by lowering the controlled weight. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an original essay Next we will do a triceps extension with concentric and eccentric but not isometric contraction. And once again you're stronger at the concentric point because you're almost relaxing at the eccentric point. With a lateral lift you have the concentric movement to raise the weight, eccentric to lower the weight and if you hold at the top the isometric movement. And the strong point would be precisely the reduction of eccentric movement. With a quad extension you have all three contractions concentric with the upward flex, eccentric when you lower it, and isometric when you maintain the compression. The strongest movement here would also be the eccentric contraction because you are generating tension in the muscle that is 50% greater than the concentric one. In a hamstring curl, concentric would be the heel curling backwards, eccentric the heel returning to fully extended and isometric when holding the weight at the top of the contraction. The strongest contraction would once again be the eccentric movement which creates a stronger tension. Now a shoulder press we have the concentric with the upward push, eccentric with the downward movement and then isometric with the grip at the top of the contraction. The strongest contraction is the eccentric one which slows down and stabilizes. With the front raise you have the concentric movement with the lift, eccentric with the lowering of the weight, and isometric with the overhead grip. The strongest contraction is once again the eccentric one because the tension is very high during the downward movement. Please note: this is just an example. Get a custom paper from our expert writers now. Get a Custom Essay A squat you will do will have a concentric motion pushing up, an eccentric with the bottom of the squat, and isometrics at the top of the squat holding. The strongest contraction would be the eccentric one because the tension is greatest at the bottom of the squat. With a lat pull down you have concentric motion with the lat pull with the downward movement and contraction of the lat, eccentric when you extend back up, and then isometric when you hold the lat pull down down. The strongest contraction will be the eccentric upward contraction which controls all the upward tension. In the last row you have the concentric movement when you bring the weight towards the body, the eccentric when you slowly bring the weight out and the isometric when you keep the compression at the top. The strongest contraction is the eccentric one when the weight is lowered controlled by the compression at the top. What I learned is where the contraction is strongest and I also felt the difference, so now I have something to show and tell clients to help them understand the workouts better.