Just in case anyone is interested in my progress... :) Seems that I lost some weight since then.

I repaired my bicycle and drove it a little bit. Seems that I'm in better shape than I thought. After first few days I drove to 'Ada Ciganlija' lake and back to my home. Total of ~ 40 - 45 Km for that day. And bike-computer showed 500 - 600 Calories spent.

Since I was on vacation after that (which could have been better if it wasn't raining for few days) and now it's raining here - I couldn't repeat it afterwards. But plan is to repeat that drive 2 - 3 times a week, while other days would be abs, push-ups, some weights ...etc.