Push-up position with your feet on the bars and your hands gripping the bar, bend and stretch your arms (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, the shoulders are fixed and pulled down towards the hips.
Lighten:
Lower your upper body less (hardly bend your arms); normal push-ups on the floor (possibly even place your knees on the floor (feet held high). Standing upright, lean forwards and support your upper body with your hands on the bars with your arms outstretched, then bend and stretch your arms (bring your chest to the bar and back to the starting position).
Harden:
Additional weight (on your back).
