Endurance (Option 2.) Workout

Row/Bike/Run/Ski

A.
Warm up:
5-10min.
Include 2-3x 20-30s. Hard pace sprints
+ stretch

B.
6x
3min.: 110-120%/avg
1min.: Rest / 50-60%/avg

Rest 5min...

C.
3x 20s. All out sprints / Rest 2:40

D.
Cool down
5-10min.
+ stretch