Is slendertone healthy for you?

Abdominal Toning: Belt- i would like to see medical research that demonstrates it's efficacy. I believe that toning of abdominal muscles should be done through exercise. For flat abdomen eat healthfully ; be physically active. Calories burned must > calories consumed. To tighten ab's: crunches, reverse crunches, exercise ball crunches, pelvic thrusts, lying leg raises, side bridge ; “bicycling” exercise on your >.