A large fitness mat made from heavy duty PVC can protect your floor if you decide to bring in exercise equipment. Place this under your treadmill, spin bike, rowing machine, weight bench, and so on. It will absorb the impact and prevent scratches from forming. It will also prevent carpet fibers from getting trapped in moving parts underneath.
You can also use the mat for exercises that require you to go into a horizontal position such as sit-ups, planks, push-ups, crunches, bridges, and the like. You can use it when following yoga and pilates videos on a large screen.
This can reduce the impact on your knees for jumping exercises so consider getting it for plyometrics. You can be more comfortable doing your jumping jacks and jump rope routines. You will even protect the floor from your sweat and get a high-grip surface on which to move.