When riding in a bunch remember that what you do on your bike will affect the person behind you, so in the interests of safety always make your actions clear and predictable. If you are going to stand and stretch make sure you call out “STANDING” and wait a second then stand and stretch. This is important because when you stop pedaling and stand you immediately rock your bike back. This could easily cause the rider behind you to touch wheels with you, and as we all know this can be disastrous. This is called rocking! So please cycle safely.