When spring has came, we have a lot more energy for everyday activities. We are doing overhauls in our apartments, rearranging the garden, sometimes even going for a short trip to the Paris. But the most humans start to exercising. They are going to the gym, practicing Yoga, having pleasant fun on the tennis court. When you don't have to much time for any tasks like that, and you still wish to get in shape, you should begin to use a bicycle. But not normal one - so design your own bike!