These things are awesome: (not me. Also, hit mute)
Cost 1000 yen, and they hit muscles you didn't even know you had. When I started, I couldn't do a single rep, and now I can do 50 in a row. I can almost do one on my feet rather than my knees, but that is f*cking hard.
I do push-ups, sit-ups and all kinds of stuff with two adjustable dumbbells. I walk all over the place as part of my job, and I watch my calorie intake. As Kevin Spacey said in American Beauty, I want to look good naked.