Bend forward at the waist and place hands on the ground into a pike position. Walk your hands forward until you reach the high plank position. Engage the abdominals and keep your body as straight as possible. Then, take small steps walking your feet forward until you reach your hands. Repeat.
If you have a tight back or hamstrings, you can allow more distance between your feet and hands in the pike position. For an added challenge, add a pushup in the high plank position.
Taking too large of steps and/or moving too quickly.
Shoulders, Abdominals, Hamstrings.