I’ve just come back from a Wingfoil Racing World Cup in Silvaplana, the beautiful lake, 1800 metres up in the Swiss Alps. Wingfoiling is a seriously aerobic sport at the elite level. The harder you pump your legs to work the foil through the water, combined with pumping your arms to wind-whack more air into the wing, the higher and faster you can go upwind.
All of this ‘pump and grind’ gets even harder operating in the thin mountain air. Some of the riders were recording peak heart rates in excess of 200 beats per minute. If you
