Race walking: 600
Uphill walking, 10% incline (3 mph): 500
Walking, 15-lb. backpack (4 mph): 410
Brisk walking (4mph): 350
Slow running (5 mph): 550
Recreational tennis, singles: 430
Swimming, slow crawl: 400
(The Wellness Guide to Lifelong Fitness, by Timothy White, PhD.,
and the editors of the University of California at Berkeley Wellness Letter)