Everytime you exercise you feel great, you're happy you took the time to get sweaty, you look better each day than the day before. And everyday, as you think back to when you could only do X amount of Y (5 minutes of running, 10 pushups), and now you can do Z of Y, you can feel good about that and feel success.
It could be breakdancing holds for all anyone cares, or jumprope, but it feels good, and if you move safely and comfortably and repeat in an intelligent manner (practice intelligently to maximize gains, or at least ensure them) you're pretty close to guaranteed gains over time. And those feel great!