New Study Proves Traditional Crunch Still More Effective Than Popular ...

... Ab Roller, Ab Lounge, Perfect Sit-Up, Ab Coaster, Ab Rocket, Ab Wheel and Ab Straps, as well as exercises including the yoga boat pose, stability ball crunch, decline bench curl-up, captain's chair crunch, bicycle crunch, side plank and front plank. ...

http://ift.tt/1nZHmD2