Why not do something that is easy to maintain on a daily/weekly basis? I cycle to work every day (approx. 11 km, so 22 km per day). In the summer I usually take

Why not do something that is easy to maintain on a daily/weekly basis? I cycle to work every day (approx. 11 km, so 22 km per day). In the summer I usually take a route where I have to climb quite a bit twice a week. Going by train/car takes approximately the same time. I am fit and have a good weight. When I was still studying, I climbed indoor twice a week, which made me extremely fit. But after a couple of years I got bored. I am on a regular Dutch/Germany diet.