Ways to make it easier:
- Decreasing the Range of Motion - partial reps, only go as far as you can handle
- Holding onto something for support/stability
- Swinging your arms for momentum
- Regressing to an easier variation/exercise
Ways to make it harder:
- Playing with the Tempo & adding an Isometric phase (pause/hold)
- Doing it with a single leg
- Using the intended muscles mostly - jumping with minimal force generated from the upper leg muscles and momentum
- Adding resistance - holding a dumbbell or something
- Progressing to a harder variation/exercise