Dropping heavy weights on a concrete subfloor gets old fast, and a proper rubber installation changes your whole routine by saving your joints and silencing the room. You can usually get the materials and labor sorted in a weekend once the kit arrives, and the best time to buy is during late-summer or New Year bulk supplier sales when fitness gear goes on discount.
Before you commit to a single price, get at least three quotes from local flooring installers to see who actually knows how to cut dense rubber cleanly. Make sure they account for subfloor prep so your seams stay tight and do not curl up after a month of heavy use.
That 0% intro APR for 15 months on purchases and balance transfers is a hard deadline, not free money, so if you still have a balance left when those 15 months are up, you'll get hit with interest on the whole original amount.