 |
 |
 |
 |
| That exercise resulted in a flat tire, one of several for the day |
 |
| Mark quickly pulls out the old tube... |
 |
| ...prepares the new tube... |
 |
| ...and puts it back in the tire. |
 |
| Next is to practice the crouch position on a little dirt hill |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |