The purple band is not even close to being "ultra heavy". I have three really old resistance bands from the first p90x and they all offer more resistance than this band does. I'm not a overly strong guy either, I am 5'7" and 175lbs. To me if it says ultra heavy I should only be able to do maybe 2-6 reps per set depending on what exercise I am doing. No matter how many loops I used and no matter how many times I wrapped this around a bar or something to try and shorten the band and up the resistance I could still easily do at least 10 reps of every exercise I did.