Cruches are often misunderstood. Compress the abs like an accordion, bring your ribcage to your pelvis, rather than folding in half like a situp. Tuck your tailbone up off the ground to enhance the workout!
4 stretches you should be doing (but aren't): Did you know your neck crick or shoulder ache may actually mean you're tight somewhere else? Troubleshoot your sore spots and work out the real pain points in just a few minutes a day. | Health.com