3 reps doesn’t sound so bad. But doing it 7 times, whoa!!! It’s a bit of strength and endurance.
Then, if you didn’t get enough endurance from the strength part, go ahead and hit some cardio with the bonus WOD.
Deadlift 3-3-3-3-3-3-3 reps
Bonus WOD (optional):
Run 200 meters 12 Burpees 6 Box Jumps 9 Bupees 9 Box Jumps 6 Burpees 12 Box Jumps Run 200 meters