I recently bought this set for myself and being a former competitive bodybuilder, I grew up using free weights, but with the pandemic I got used to working out at home and trying different things, including bands. This set of bands has been put to the test with stretch and weight (I often use the 50 and 40 lbs together), and they've held up. The door attachment and leg straps added variety. I'm confident they will stand the test of time and strength and even just bought the 100 lb set for my girlfriend.