Kilian Jornet Instagram – To be a great runner, I believe you need to be good at cross-training and supplementing your mileage with different forms of activity. That’s why I take a long break during the winter to focus on skiing, ice climbing, and cycling indoors. My cross-training is rigorous, with SkiMo sessions up to 6 hours long. This saves my muscle fascia, helps me recover, and builds my aerobic base in the lower-intensity heart rate zones, which I monitor with my @corosglobal APEX 2 Pro. When I come back in the spring, I’m even stronger. In fact, my COROS data shows that I typically increase my Base Fitness during this time period. I collaborated on a blog with COROS to give you my top 6 training tips for cross-training, and what happens to the body when you focus on building strength in other areas. Tap the link in my bio to read more. #trainwithCOROS 📷 @matti_bernitz