When spring has came, we have much more energy for each day activities. We are doing renovations in our apartments, rearranging the garden, sometimes also going for a short trip to the mountain. But the most humans start to exercising. They are going to the gym, practicing Yoga, having pleasant fun on the mini golf. When you do not have to much time for any tasks like that, and you still want to get in shape, you should begin to use a bicycle. But not regular one – you have to design your own bike!