Angle of exercises (1) As well as in the gym, the exercises are varied to locate the effort in different parts of the same muscular group (for example chest in flat bench for the central part, inclined bench for the upper part and bench with angle greater than 180º for the bottom), also in Calisthenics and similar systems we can take advantage of the letter of movement angle. Let's take arm flexions as an example, we usually do them on the floor, which stimulates the middle part of the chest, but what happens if we put our feet on a chair.