Get our introductory offer at only
*$0.99/month for first 3 months
$29.90/month for the next 9 months
WHEN health journalist Christie Aschwanden was travelling the world as a competitive ski racer in the 1990s and 2000s, recovery between training sessions basically meant doing nothing - taking a day to sleep in or lie around with a good book.
About a decade ago, she noticed something had