Airdyne conditioning:

5:00 sprint
2:00 rest
4:00 sprint
2:00 rest
3:00 sprint
2:00 rest
1:00 sprint

Results:  101 calories in 5:00; 64 calories in 4:00; 50 calories in 3:00; 36 calories in 2:00; 22 calories in 1:00