Why rollerski? Ski training during the summer and fall is critical to improving cross country ski technique and fitness. Rollerskiing is an important part of a well-rounded summer program because rollerskis do an excellent job imitating on-snow training. Like skiing on snow, rollerskiing exercises arms, legs, core and improves cardiovascular fitness. Rollerskiing is also great training for injured runners who are looking for an alternative low-impact, weight bearing workout. The saying “Skiers are made in...