See attached for the Conquer Magnetic Rowing Machine manual/instructions. Thanks!
Links to replace the cord:
https://www.homedepot.com/p/T-W-Evans-Cordage-5-16-in-x-50-ft-Elastic-Bungee-Shock-Cord-SC-516-050/205327137?MERCH=REC-_-pipsem-_-205327127-_-205327137-_-N - Link to the elastic bungee cord, you only need 87 inches (This is 50ft)