Assault Bike 40 minutes @ 6 + 75/60 Calorie Surges

@ 10:00, 20:00, and 30:00, Bike 75/60 Calories @ 9

Notes
Over the course of each 10 minute set, you should be gradually building your pace to a near maximal effort at the allotted time. Then cool down/recover as you enter the next segment, and start building your pace again.

Post results to comments.