"X marks the spot" description

[broli]

X Marks the Spot Workout

X Marks the spot aerobic workout

darebee.com

I think something is missing after "a little time on their hands":

This is one for those who hate running but like cardio, or who know they need cardio but don't want to hit the road or simply have a little time on their hands the need to push their aerobic performance levels up a notch.