My trainer at the gym introduced me to
https://patents.google.com/patent/US10245460B2/en?oq=1024546...
which sells for about $250 (worth it if you really use it.) My first instinct is that this product ought to be available for $25 on Temu if there wasn't a patent but I know from experience that if I talked to folks at TRX they'd have a good explanation of why my number is low. (e.g. TRX is in a position to pass costs on)