Bend and stretch your arms in the push-up position (lower and raise your upper body). In the deep push-up position, the elbows are at the side of the body (no outward movement of the elbows).
Attention:
No hollow back and the elbows bent at an angle of approx. 45° from the upper body ("A" shape with the arms). The shoulders are fixed and pulled down towards the hips.
Lighten:
Place your knees on the floor (feet held high); lower your upper body less (arms barely bent); support your arms on a raised surface.
Harden:
Additional weight (on your back); place your legs on a raised surface; unstable surface for your arms and/or legs; try out push-up variations (e.g. clapping your hands).: clap your hands, one-arm, "crab", "spartan", "superman", "leg flag", "aztec" or "shaolin" push-ups).
Variant:
Vary the position of the hands/arms (e.g.: wide, narrow, together).