Begin again simultaneously after thirty seconds rest. At that point, the sprinter slows down and takes the lead for the next length. The swimmer at the rear is in the sprinting position. With four swimmers per lane, each will sprint one out of every four lengths. Continue the rotation for 15 minutes.
Swimmers go to middle of the pool and face each other standing roughly six feet apart.
A kick board is placed between the swimmers and both grab, with arms extended, the near end of the board. At the starting signal, both swimmers begin kicking at top speed. The objective is to move yourself forward or to push your partner backwards. Do ten times. For variety, change style of kick - both swimmers should do the same kick.