Maxadrex After that, roll the ball towards the chest and the back. Try to use the abs to drag the knees to the chest and push the feet back. Keep your back completely flat and your hips tight. Avoid moving the upper body. practice this for 3 sets and 10 reps each. 7. Pose Plank In this list of the best exercises for endurance sex here, this is the move that could make practitioners more sexually confident, strong, and bold.