since you're in NYC, i would HIGHLY suggest taking up sport/olympic fencing.
its really quite similar to tennis, except it requires less space. NYC is one of the best locations to do it. its both physically and mentally challenging and is competitive enough to suck you in, if you enjoy competing, so that you'll want to exercise and train to become more fit so that you'll do better.
its how i stay healthy. for reference, i'm an ex personal trainer, ex lifeguard, and ex professional martial artist.
its really quite similar to tennis, except it requires less space. NYC is one of the best locations to do it. its both physically and mentally challenging and is competitive enough to suck you in, if you enjoy competing, so that you'll want to exercise and train to become more fit so that you'll do better.
its how i stay healthy. for reference, i'm an ex personal trainer, ex lifeguard, and ex professional martial artist.