I bought these bands for some rehab at home after having surgery on a severe tendon tear in my shoulder.  The easier bands are all I have been able to use thus far, however, I'm looking forward to using the heavier blue and black ones once my strength comes back.  I also happen to be a Certified Personal Fitness Trainer and would definitely use this equipment if I was working with a beginner or intermediate (male or female) at their home or office.  VERY VERSATILE equipment that allows for an incredible range of motion/movements.  The clips are easy to attach/detach and the door anchor allows a full range of positioning.  There are probably 50 different exercises (maybe more) you can do with these bands.