Go for 12 crunches on one side, then repeat on the other ... Harvard Medical School says that sit-ups are hard on your back because “they push your curved spine against the floor and work ...

Go for 12 crunches on one side, then repeat on the other ... Harvard Medical School says that sit-ups are hard on your back because “they push your curved spine against the floor and work ...

If you’re a little hazy on the difference between sit-ups vs. crunches, you’re not alone ... transverse abdominis (deep core ...

A long, long time ago, I bought one of those ab crunch roller devices, the one that looks a bit like two snakes sitting up ...