Irish IndependentKarl Henry: health, fitness, nutrition - on your bikeIrish IndependentKarl Henry: health, fitness, nutrition - on your bike. Karl Henry. Published 24/08/2014 | 02:30. 0 Comments; Share. Karl Henry. Sweet potatoes are a super source of slow-release carbs. I am a runner, walker, swimmer, surfer, mountain biker and cyclist.