To do this exercise, balance equally on all fours with a straight spine and the abdominal muscles drawn in and braced.
Without shifting the spine or pelvis raise one arm and the opposite leg. This is a progression of the arm reach and the leg reach, and your goal is to stabilize the spine.
Breathe normally while holding for six to eight seconds.
Repeat with the other arm and leg.
Cycle through each position five to six times.