Personalized Mom's Gym Buddy Fitness Workout Toddler Long Sleeve T-Shirt. Mom's gym buddy Toddler Long Sleeve Tee - Charcoal workout apparel for kids who accompany Mom when he goes to the gym or does a work out at home. A classic for Fall, Winter and Spring, these long sleeve toddler t-shirts are sure to be a staple in your child's wardrobe. Whether layered or alone, this t-shirt is soft yet durable enough to stand up to your toddler's playtime demands.