Here's a short summary of the things I've achieved within those 21 days:
1. Minimized my fat & sugar consumption
Instead, I decided to stick to low-calorie, fulfilling meals. For snacks I was choosing nuts, berries and seeds instead of sugary buns or chocolates.
2. Instead of taking a bus to work, I chose bike
Within 21 days I managed to bike 2.7x2x21 = 113 kilometers!
3. Improved my running speed
Went for a run …