Teams of 3. One member use the bike.
Other two members use rowers.
Switch as needed
Cover 3000 calories
1000 calories must be on the bike
-Cover 2750 calories
-Bike 750 cal
Cover 2500 calories
Bike 500 cal
If only a team of 2 then cover 2000 calories, with 1000 of these on the bike, and scale accordingly for intermediate and beginner options (1750 and 1500 respectively)
If only one person, then bike 1000 calories (750 and 500 for intermediate and beginner