AREAS OF INTEREST: RUNNING, CYCLING, JOGGING, WALKING, CARDIOVASCULAR ENDURANCE, CROSS-TRAINING. by: Tom Seabourne Ph. D If you are just beginning, walk before you jog. Walking for thirty minutes will prepare your muscles for jogging. When you can walk continuously for thirty minutes, you are ready to jog. On your first walk-jog workout, walk for seven minutes and … [Read more...] about RUNNERS IMPROVE THEIR PERFORMANCE USING THE SPORTCORD AND AQUAJOGGER.