Table 2. Trunk muscle stabilization intervention exercise program.

Stage	Time	Contents	Program
Warming-up exercise	5 min	Flexibility whole-body exercise	Upper-lower extremity stretching and joint moving exercise
Main exercise	20 min	Trunk muscle stabilization exercise	Stage 1	1) Pelvic posterior tilting in a supine position with both knees flexed
				2) Abdominal draw-in in a supine position with both knees flexed
				3) Pelvic anterior tilting in a supine position with both knees extended
			Stage 2	4) Abdominal draw-in in a supine position with both knees extended
				5) Bridging in supine position
			Stage 3	6) Ball bridge
				7) Unstable bridging: bridging with extension of the left/right leg
Cool-down exercise	5 min	Aerobic exercise	Breathing with abdominal muscles