Flat abs in 5 minutes - great idea for ab workout!
Top 10 Hardest Core Exercises! How Many Could You Do? - YouTube
The 5 to 50 Ab Workout. Feel the burn and love the results! Pin now, check later.
These will totally change the way you think about exercising your core.
5 exercises that really did keep my abs sore for days...
15-Minute Towel Core Workout - a mix of sliding plank work and kneeling core exercises
planks, planks you should be doing, workout, core workout, core, handstands
Flat Abs In 5 Workout Infographic