do your kids excersize?

Yes. Both of them are in karate and my oldest starts tball on Saturday. We will be enrolling both of them in fall soccer as well

Dance, Walk w/me, play at the playground etc.

She dances to stuff like this : 

http://www.youtube.com/watch?v=t8LmUnMfjsk

Yes! Both doing what any 5 yr old that LOVES being outside does and soccer - German soccer (a full hour of non-stop training).

their play is very active and their little bodies are very strong and muscular looking imo. they are also involved in t-ball, sometimes do pilates or the 30-day shred with me (i bought them each a set of 2 lb weights - super cute watching them do squat-presses lol) and i was thinking of letting them try out the zumba for littles at the y soon.

My dd does kid Zumba and she really enjoys it

My oldest plays baseball, the two youngest generally don't stop moving all day, they just go and go till they drop!

Baseball, tball, ballet, soccer, and outside time

Everyday they are active and I suppose you could call that exercise. We get outside and to the playground as much as possible. If it's nice out, we're out running around. Although this week has been sluggish; 4 consecutive days of rain. Uugghh.

Ds doesn't do anything specific but he runs around the house non stop all day.

 dd is 4.5. She is in soccer, dance and gymnastics. We hike or bike on the weekends. she also does nick jr fit and just dance with me.