Programmed To Run

Author Tom Miller is the guy who studied the effect of high intensity cycling on 10K performance.   In combination with mental training, his group of runners that performed cycling intervals once a week improved their average 10K time from 50.2 minutes to 44.4 minutes!  (from Programmed to Run-p 70)

MY COMMENT:  I've always enjoyed high intensity uphill cycling as a cross training workout once or twice a week.