Abs of Steel
Yes, it is true. You can do crunches for days and never see the results you’re looking for! For a cutting edge exercise that tones the abdominal muscles like nothing else, try a Swiss-Ball Jackknife. All you need is a medicine ball and your own body weight.
Roll forward on the ball until your shins are resting on it, assuming a pushup position with straight arms. Without any changes to your posture, roll the ball toward your chest by pulling it forward with your feet. Hold, then return the ball back to starting position. IMPORTANT: Try not to change your posture. Matky etruske Keep a nice straight line with the body, not allowing your hips to hike up toward the ceiling.
Do this 8-10 times, 3 sets total. If you want an extra challenge, come down to a mat for a plank hold on your forearms for at least 30 seconds after each set. Your abs will thank you for it!