No strength or skill.  Workout of the Day: "Flight Simulator" 5 unbroken double unders 10 unbroken double unders 15 unbroken double unders 20 unbroken double unders 25 unbroken double unders 30 unbroken double unders 35 unbroken double unders 40 unbroken double unders 45 unbroken double unders 50 unbroken double unders 45 unbroken double unders 40 unbroken double unders 35 unbroken...