. The lunges help you run more smoothly. To derive enough intensity from the 15-minute run, you have to push your heart rate up to 85 to 95 per cent of maximum. That's about your 10K race pace."Verdict I did my five minutes of calisthenics in the bushes behind

? When Einstein runners finish a session, they don't write essays or poems. They record their numbers. How far did I run today? What was the temperature and humidity? My pre- and post-run weight? My average and maximum heart rate? Mission impossible

.”He started by devising a simple experiment with a small group of subjects who ran or bicycled for 40 minutes at 76 per cent of their maximum heart rate, and then had blood samples drawn immediately after exercising. Next the blood samples were flown to a