I bought a stationary bike and found it much more tiring than riding a real bicycle. A regular bicycle can go downhill for 500 meters with ease, while the stationary bike can't glide at all.

Hopefully I can lose some weight with this. Yesterday I talked to the doctor about the pain in my right knee. The doctor said there is nothing wrong with the knee (for now), just me being overweight and my knee is not happy about that. If I don't start losing weight immediately, there will be serious issues with knee in the foreseeable future.