Lifting and lowering as well as rotating the upper body in supine position alternately (trunk bend) ► cross crunch

Individual work

Lie on your back with your legs bent and your feet hooked onto the (very low) horizontal bar (or wall bars) (instep on the bar/bar), arms bent so that each hand is placed next to the nearest ear. Raise and rotate the upper body to move the elbow crosswise to the knee. Lower your upper body and return to the starting position. Switch sides with each repetition.

Attention:
Do not lower your upper body completely (constant tension), do not pull your head with your hands (really keep your hand next to your ear).

Lighten:
Lift your upper body less; cross your arms over your chest.

Harden:
Stretch your arms above your head (holding them up) and move your hand (possibly even with additional weight) crosswise to your knee (work without momentum).

2 weight cuffs/weight balls/weight discs (small)/dumbbells ► Make the exercise more difficult (additional weight)