Start in a standing position with the feet together.
Standing on the left leg, lift the right leg off the floor and bring the knee up towards the chest.
Lean your upper body forward and reach your right leg out behind you.
Bring the knee back up towards the chest and repeat.
Perform 10-15 reps on one leg and then switch legs. Add variety by moving the arms in a running motion or bringing the arms close to the floor deepening the lunge.