Spending long days with your toddler is a blessing — or so you’ve been told. Truth is, parenting toddlers is hard work. Full days can feel never-ending, leaving you exhausted and, well, defeated.

A herd of toddlers runs across the springy gymnastics mat, each to a small square of carpet. Their parents follow close behind. Once seated, coach Marci Schuster takes them through some warm-up ...