The fact is that there are lots of people who simply don't like cycling. I am one of them. I mean, it's OK sometimes. But whenever I have tried to set up a regime of riding my bike to work, it never lasts long. This is for two reasons. Firstly, I don't like forms of exercise that use your personal performance as the main goal. Instead, I like playing squash. I like playing football. I like swimming (though not competitively). These activities are fun in themselves, and provide good exercise without forcing you to grit your teeth against your physical limitations.