The 13 Best Abs Exercises You Can Do Standing Up

3. Stabilization of the trunk while standing

• Feet hip-width apart, shoulders down, arms out in front of the chest, holding medicine ball or dumbbells. 
• Keeping your arms straight, rotate your upper body to the right, and then return to the center. 
• Do 10 repetitions to the right and 10 to the left. 
• Then alternately in both directions 10 times.