I'm looking to buy a piece of exercise equipment to help me stay in shape as it gets colder, but we don't have a ton of space in our rowhouse, so it has to be something small - like a foldable bike, treadmill, stepper etc.
I'm not in great shape - 45 years old and 135 lbs. When it is nice out, I walk 3 miles a day, but want another option for when it is colder. But it just has to be a decent machine. Nothing fancy.