Theatre On Ice is growing across the United States, and Belmont is well-represented as the figure skating discipline surges. Ten Belmont youth competed in Theatre On Ice at the biennial Nations Cup last month in East Lansing, Michigan, with their Skating Club of Boston teams, and a handful will continue on to the nationals in Irvine, California, in late June. “I think we’re so successful because I’ve noticed at competitions, we get very pumped up, and the energy is positive,”…