Ellie - I go thru the same question of torment.

Historically, I have the habit of laxing off on gym visits. Then hating myself for wasting the membership money (which is not cheap these days by any means).

At least if I buy my own equipment, it'll retail at some future garage sale of mine. And nobody else is ever on it when I need it

Seriously, if you have the space, invest in whatever equipment you want. I have a treadmill, a rowing machine, free weights, work out videos (yoga and aerobic) and those latex strap things for when I travel to hotels with no work-out facility. In fair weather most of my aerobic exercise is gotten in the great out of doors, so except for the weights most of my stuff is for bad weather.

Anyway, especially in the winter, it is just so much more convenient to work out at home. When the mood strikes,I only have to strap on the runners and I'm ready. I don't even have to start the car.