20 min of backward attempts up Baltimore hill.
Go at a pace that suits you according to your individual work capacity, coordination and comfort travelling backwards. You can walk or jog or run. Be cautious of obstacles, cars and people.
Rest as needed but try to take recovery on the trip back down the hill, while keeping a consistent effort going up the hill. Concentrate on keeping your feet under you and not swinging legs out to the side of your body. Be sure to use the big-toe side of your foot when incorporating a toe-to-heel action.