[Back In The Saddle]

The way I was taught to do it goes like this:

1. Trail extends his arm toward the lead with a fist, thumb on top.
2. Lead mirrors the signal back to the trail.
3. Trail and lead simultaneously pump the fist up and down three times.
4. After the third pump, each partner chooses and displays either rock, paper, or scissors.
5. Loser buys.

But it may say something different in the manual