When the goal is to target the glutes, exhale at the point where the pelvis and spine are aligned, tighten the glutes, and hold for 1-2 seconds. Then, slowly inhale and return to the starting position. When the goal is to target the spinal erectors, exhale while lifting the upper body until it is parallel to the ground, maintaining the position without bending the upper body. After 2-3 seconds, inhale and return to the starting position. (Exercising this way is more effective because it involves the starting and ending points of the muscles passing through certain joints, allowing our body to create maximum resistance using Earth's gravity. Of course, this cannot be said to be the best method. Each person may be accustomed to their own exercise methods and may believe their own way is more effective, and that is also to be respected.)