I remember tae bo. It taught me how to kick someone's ass while doing jazz hands. My two cents is, if you can afford the membership, bite the bullet and hit the gym. No one should give you any flack about it. Gyms are to help people get in shape and stay in shape...no matter where you are in that spectrum. Granted, some people use the gym as a place to prance around like muscle-bound peacocks, but that's not really what they're for.
If you're into the outdoors scene, and live near some good trails, try taking in some scenery and fresh air sometime.