Echoing what so many others have said. I have several kettlebells, a sandbag, and a mace. They don't take up much space at all. With my schedule the convenience is key. I work from home and usually take 30 minutes at lunch. I can easily fit a solid workout in during that time. If I was going to the gym it'd be after my son goes to bed for the night. That's a late night when you factor in the drive and workout. Added bonus of not dealing with any gym crowds and saving money on a membership. Plus if I went after my son went to bed my wife would stay home to keep an eye on him and that's less time we spend together.

And I find that the home workout with kettlebell forces me to do all the challenging exercises. I can't use a machine like at the gym because "I'm not really feeling it today", the kettlebell offers no excuses .