IT WORKS EVEN WITH OUT EXERCISE GAVE IT TO TEN COWORKERS EACH ONE LOST THE WT. SOME PEOPLE CAN'T USE IT BECAUSE OF THE MEDICATION THERE ON BECAUSE OF THE GRAPEFRUIT. PS: EXERCISE WILL SPEED UP THE LOST I GAVE IT TO MY STEPSON AN HE DID IT WATCHING TV AN I KNEW IT WOULD NOT WORK BUT I WAS WRONG WRONG WRONG JUST DO IT.