5-Minute Workout That Replaces High-Intensity Cardio
5 Minute Plank Challenge + Ab Workout Form Tutorial (Avoid Mistakes!)
Phil Black's 5-Minute Plank Challenge
The Internet says that it takes 150 minutes a week to go in for sports to stay in good physical shape. I do 4 times a week, for about 15-25 minutes. Then I stretch for 25 minutes. Can stretching count as extra workout time?