Digging, weeding, raking, cutting, and hauling build strength, flexibility, and stamina. Sweep some snow. Unless you're in reasonably good shape, stick to small accumulations of dry, powdery snow, the kind that can be swept with a broom. Snow shovelling can be very strenuous, and every winter people suffer heart attacks from overexertion. People with diabetes probably shouldn't shovel heavy wet snow or major accumulations.
Infants love motion.
Put the little one in a backpack or stroller and take a walk. Weight train with the baby. Press the youngster over your head once or twice. When you feel ready, increase the number. Push the child.