The 13 Best Abs Exercises You Can Do Standing Up

8. Cross-touch toes

• Feet wider than hip-width apart, arms spread out in the shape of the letter T.
• Tighten your core muscles, rotate your torso to the left and reach with your right hand to the outside of your left foot. 
• Perform 60 seconds on the left side and the same on the right side. 
• Then alternately on both sides for 60 seconds.