Gymnastic rings! With a set of these you can:

• Muscle Up
• Body Lever
• Archer Fly
• Ring Split

And that is just a start. Get yourself over to Gymanstic Bodies for more ideas! As for legs, sprinting and pistols require no kit. You might want to fill a sandbag for some lift and carry moves.

I have no ventilation (apart form opening my garage door) and no heating apart from hard work. Works for me year round in the UK. I don't care to be comfortable, just to put in some hard work.

Suggest you be very clear about two things:

Is the area you propose to dedicate to the gym, going to be large enough to use the equipment? And are you sure you don't need that garage space for other purposes? If so, then ask:

Are you confident that working out at home is preferable to gym?

I had a home indoor gym at one point, and a garage indoor gym at at another time. Eventually I realized I missed, and liked, working out at a public gym. Serious public gyms where people actually lift, rather than sit around on big rubber balls pretending to do something useful related to their "core."

I'm back at the gym these days, and my home is free of athletic equipment. This works best for me. I should add: I have a home office, thus work at home. I need excuses to get out!

If you're sure about the home gym, then be sure your garage is big enough so you're not cramped moving among equipment.

I converted my basement living room. There is a bench, treadmill, television, and mat down there. The mat is useful for ab workouts. The downside is poor ventilation.

I would install a nice, solid chin-up bar. All you need is three segments of pipe, a few tools, and decent DIY construction skills.

If you can afford it, I suggest that you think seriously about including a rowing machine in your gym.

No, I converted my garage into a hangar to build an airplane!

I turned my detached garage into a woodshop/weightlifting room. Mostly just a power rack (power tech), homemade cable systems, some weights and an adjustable bench. I've really gotten into the "make your own equipment" mindset and wish I would have tried to build my own squat rack, oh well, it's a good one.

I don't do cardio though. Like the primal blueprint fitness plan, I lift heavy things, walk at a moderate pace a lot, and sprint once a week. I rather enjoy sprints, but I don't do it here at home, I run up to the local school.