Fitness experts weigh in on the differences between concentric vs. eccentric exercise, and why both are important.

Here, the muscles are contracting isometrically to hold this gymnast in the crucifix position and are not changing length. When the isometric contractions end, isotonic contraction will occur.

When deciding between isometric and isotonic exercises ... Concentric vs eccentric vs isometric training: How to train for each phase “Each type of contraction offers distinct advantages ...

Here, the muscles are contracting isometrically to hold this gymnast in the crucifix position and are not changing length. When the isometric contractions end, isotonic contraction will occur.

The purpose of this study was to compare an acute bout of either isometric or isotonic muscle contractions on patellar tendon pain and function and maximal voluntary isometric leg extension torque.