Warning: Undefined array key "visitor_referer_type" in /var/www/vhosts/wordinf.com/core/app/libraries/Core.php on line 98 Sylvester Stallone - Crunches are much more effective...
Crunches are much more effective than regular sit-ups because they specifically target your upper abdominal muscles rather than your hip muscles. If you're not used to them, they can cause soreness a day or two later, but it's a 'cool' soreness. A badge of honor.