If you do yoga or workout you might find your kids are interested in the same.  My younger son started doing yoga with us when he was three.  He’s pretty good a down dog!  Here are some area places where your kids can take yoga or fitness classes:

fitness

Trying to copy mom

Lifetime Fitness
fitness and yoga classes for all ages, homeschool classes

Elena English Zumba
Zumba for kids in Collierville and Germantown

Co-Motion Studios
Midtown
a variety of creative movement styles for all ages including hula hoop dance, circus & flow arts, yoga, and a number of modern and world dance and movement styles

Fusion Fitness
Kids Fusion is a fitness class that fuses fitness with a wide variety of dance styles ranging from Latin and Hip Hop to Jazz and Jive.  Ages 4-12

Delta Groove Yoga
Midtown
Mommy & Me yoga, prenatal yoga and kid yoga for ages 3-8