Dynastride

Dynastriding, an aerobic exercise that combines the vigorous swinging of the arms with dynamically striding steps, was developed by fitness pioneer Jack LaLanne soon after he opened his first ""physical culture studio'' in 1936. Here, his wife, now in her 60s, adapts that stretching-walking concept to a series of progressively more vigorous programs for ``older'' exercisers. Better focused than her recent Fitness After 50, this illustrated manual ranges from the simple and routine to the more difficult and imaginatively varied. The One-Day-at-a-Time Starter's Program, for example, is followed by the 90-Day Miracle that prepares intermediates for the advanced Top-of-the-Pyramid regimen. As a bonus, this deft mix of sound health and exercise guidance and motivational cheerleading includes forms to help walkers track their progress. Author tour. (March)