This was my first purchase and use of resistance bands.  I have limited mobility due to my health, weight and age and my doctor recommended I try these for low impact exercising to start with.  I have been able to find a number of workout routines online even some I can do sitting in a sturdy chair.  With diet and the use of these bands for at least 30 minutes a day I have already lost 10 pounds.  I am sure my doctor will be as happy as I am.