I've just gotten back into exercising for an hour a day. The novelty of circulation! Being able to move without giving your body ten hour's notice! It's a real joy. One of life's best.
Cycling, jumping and jogging hurt the crap out of my knees, though, and put me out of commission for at least a month. Sit-ups should be renamed back-snaps, also.
Nowadays it's running whenever the terrain is merciful, and basically walking and lugging heavy stuff back and forth. I stretch every morning and every night, and I can nearly touch the ground with my palms. My ambition is to achieve Luke Skywalker arms from The Empire Strikes Back, but failing that, I saw a wimp on the street and he looked like a good Plan B.