Ways to make it easier:
- Decreasing the lever - bending your legs / doing it on your knees
- Using your other hand and foot for support
- Using external force for support - resistance bands, a partner or something
- Regressing to an easier variation/exercise
Ways to make it harder:
- Holding it for as long as you can
- Flexing or contracting your obliques as much as possible
- Placing your feet on an unstable surface like a bosu ball
- Doing it on a declined position - just until your body is horizontally aligned
- Adding resistance - holding a dumbbell or something on your side
- Progressing to a harder variation/exercise