Start handing round a sponsorship form explaining that it is for a charity that is a) very personally meaningful to you or b) (even better) to your boss and that you are doing a sponsored bike ride at the end of the summer, so you need to get into training.
Here's a solution:
Start handing round a sponsorship form explaining that it is for a charity that is a) very personally meaningful to you or b) (even better) to your boss and that you are doing a sponsored bike ride at the end of the summer, so you need to get into training.
Hassle free cycling - jobs a good'un.