Endurance (Option 2.) Workout

Row/Run/Bike/Ski

A.
Warm up:
5-10min. Easy pace
include 2-3x 20-40s. hard pace sprints.
+ stretch

B.
7x
2min. 110-120%/20min. Avg.
1min. 50-60% / Rest

Rest 5min...

3x20s. All out sprints / Rest 2:40s.

C.
Cool down:
5-10min.
+ stretch