Improve your fitness and elevate your training by implementing resistance bands into your workout routine. These workout fitness bands are low impact and safe for users of all age groups and those looking to rehab as well. This set includes up to 5 bands with varying tensions reaching weights of up to 150 pounds stacked resistance. Each band reaches a different tension level: Blue 10 lbs., Green 20 lbs., Yellow 30 lbs., Red 40 lbs., and White 50 lbs. In general, elastic resistance bands engage muscles that focus on stabilization. These support muscles compliments larger muscle groups, so resistance band workouts are more comprehensive and targeted strength workouts.