Originally Posted by Velocirapture

Batch of three, with 4 or 5 min between those, then a proper break of 20-25 min before the next 3. Rinse and repeat.

The group is fairly big, so the coach partners up 3 or 4 of similar speed, 3 or 4 bike lengths apart. Gives you a nice rabbit to chase (or makes you a nice rabbit). Good way of making sure all the stops come out.