Many people enjoy biking. I don't, but I've come to realize that there is a lot of physics involved with biking. For instance, when you bike you are doing work. To find how much work you have to multiply the total mass of you and the bike by the acceleration due to gravity (which is 9.81 m/s^2) and then by the displacement (the distance the bike traveled). Also, you can find how much power the bike has (the rate at which the work is done) by dividing the amount of work by the amount of time the bike traveled for. It just goes to show that physics is involved in everything.