Biking is a fantastic way to gain height apart from numerous other benefits like weight loss and recreation. But you need to follow certain guidelines to maximize height gain. Like the Dutch and unlike the Germans, hold your torso erect while you ride your bike. Do not slump forward like you would in a race. Raise the handles to be able to do this. Do not lower the seat as your legs will not extend fully in that case. Adjust the height of the seat such that your legs extend fully and stretched nicely in the lowermost position of the pedal. However do not increase the height so much that your heels come off the pedal. Make sure your feet are flat on the pedal at all times. Also do not shift from side to side as you ride. Every time you get comfortable with the seat position, raise it a bit. The e-book Grow Taller 4 Idiots is full of such tips and complete exercise programs to help you grow taller fast.