Join Sean for a fast paced workout with a 21 minute first challenge to test your endurance.

• Challenge 1: Level 3 trek (fast hill) for 3 minutes, level 2 for 3 minutes (no level 1 rest). Repeat 4 times.

• Challenge 2: (10) level 3(or 4) intervals for 1 minute (alternate hill/sprint), 30 seconds recovery.

• Challenge 3: (Optional) Level 3 trek (fast hill) for 4 minutes.