2 — Biking
With an hour bike ride you can burn more than 500 hundred calories, so biking is not only for little children anymore. More and more people is becoming aware of how amazing riding a bike is for your whole body, and moreover also for the environment.
1 — Swimming
Yes, you sure can also swim indoors, however, if you are lucky enough to live somewhere where it is almost always warm, you should most definitely go outside and search for a pool, or a clean and warm lake. Outside you will not only burn some calories but also soak up some sunrays. An hour of swimming burns several hundred calories.