<human>: Objective: How to perform a push-up?

Which of the following solutions is more sound in terms of naive physics reasoning?

OPTIONS:
- Lay on the floor, belly down. Position your hands to your sides, palms flat on the floor. Push up so that your back and legs are straight, and the only things touching the floor are the feet and palms. Lower down and touch your nose to the ground, then push up again.
- Lay on the floor, belly down. Position your hands to your sides, palms flat on the floor. Push up so that your back and legs are bent, and the only things touching the floor are the feet, knees, and palms. Lower down and touch your nose to the ground, then push up again.
<bot>: Lay on the floor, belly down. Position your hands to your sides, palms flat on the floor. Push up so that your back and legs are straight, and the only things touching the floor are the feet and palms. Lower down and touch your nose to the ground, then push up again.