One participant lies on their back with their arms stretched vertically upwards, the partner supports themselves with their hands on the shins of the participant lying on the floor, is also held by the shins and lifted into a horizontal position (both participants with stretched arms). Both exercisers bend and stretch their arms at the same time (lowering and raising the participant lying on top).
Attention:
The lifted partner actively tenses their torso so that their pelvis does not sag. The elbow position is not at shoulder height, but slightly closer to the upper body ("A" shape with the arms), shoulders are fixed and pressed down towards the hips.
Lighten:
Only hold the starting position.
Harden:
Additional weight for the upper participant (on the back).
Variant:
One exerciser bends and stretches the arms, while the partner keeps the arms stretched. The roles are swapped after each exercise or from time to time.