alt Hacker NewsAgreed. I've always struggled with intense structured exercise. Instead I walk quickly, park at the far end of lots, run up the stairs instead of the elevator, do some jumping jacks while waiting for the microwave, and lots of small things like that and it seems to work. You can get a lot of exercise minutes and increased heart rate out of doing routine activities with gusto. Admittedly, it's not so good for building muscle, though.
You only need a 20ish pound set of weights to build muscle, oddly. Don't even have to spend a ton of time on it. Can do a basic set of curls/whatever while cooking breakfast.
Body weight exercises feel like they should be even easier to do, but realistically are a lot harder. Pushups, are free and can be done anywhere, sure; but are not a place to start at.