Personalized Mommy Gym Buddy Workout Toddler Long Sleeve T-Shirt. Mommy's gym buddy Toddler Long Sleeve Tee - Pink cute fitness workout outfit for boys or girls who hit the gym with their Mom. 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.