https://www.google.com/search?q=plank&ie=UTF-8&oe=UTF-8&hl=en-us&client=safari#imgrc=bofsBHyrNhLJOM:I'm 58 and weighed 235lbs this morning. I need to get back into a fitness routine. Dust off my bike and back to stretching and weight training. My diet needs improvement to. My energy level is low. I'm in. Doing this as a group will be motivating. BTW what is plank?