Rower pike-ups are a bodyweight exercise for strengthening your core, hips and shoulders without hurting your spine. Here's ...

Make sure that you're sitting back as if you're sitting ... You can speed up some. If you have more than one medicine ball, you might find that you want a lighter one for some exercises and ...

It can also be done either with or without a medicine ball. How to do it: 1. While sitting on a yoga mat with your legs bent and feet flat on the floor, pick up a medicine ball and hold it at your ...

Crunches, or V sit-ups, strengthen your abs ... with your lower legs crossed and lifted. Hold a 5-pound medicine ball (or dumbbell) between both hands. Swivel left to the right and back.

And yes, sit-ups can build stronger abs ... including sliders, a medicine ball, or even a dish towel. I recommend performing pike-ups on a wooden floor (or similar) so your feet don’t get ...