Here is a great article by Rachel Kemp, dance teacher:
Benefits of Dance, by Rachel Kemp
Toddlers love to move, stretch and jump. Teachers can introduce kids to new ways of moving their little bodies in entertaining and constructive ways. All forms of dance, and creative movement can be very beneficial. Kids should be introduced to exercise and physical exercise as early as possible. It might take a little more money, but in the long run it can pay off. Introducing your child to dance is one of the greatest gifts you can give them.
Dance promotes discipline, coordination, memory, flexibility, strength, line, grace and stamina. Performing builds positive self-esteem and confidence, helps with other sports, and is just great fun! All kids are capable of relating and understanding basic techniques that are shown to them and demonstrated properly.
The vocabulary they learn through dance can help them express themselves through movement and naturally incorporate it into their lives. Signing your child up in dance as soon as possible can be a great thing for him/her.
As long as children can listen and stay focused, no age is too young to get them started. Of course, forcing children into any activity is never healthy. It’s important to observe how they respond.
As children get older and more serious, the length of the class and the amount of class per week may increase. Again, it might mean more running around for you, but if your child is fortunate enough to find something he or she loves to do, it’s well worth the extra time and money. My parents ran around for me 4-5 times a week to participate in many classes, I don't know how they did it, but I’m so grateful, because I am now blessed to be making a living doing what I love.
Remember the 4 D’s: DISCIPLINE, DETERMINATION, DEDICATION, DESIRE. Dance class can help your child conquer all four.