How do I keep things flowing for an EXTREMELY demanding group of 4 year old students?

I have been working with preschoolers for 5 years and this is (by far) the most demanding group I’ve ever had. They are a clan of type A’s and ALL need attention RIGHT NOW! Two in particular have severe impulse control issues and walk into the room as ticking time bombs of explosive physical energy. We play outside a lot, and there is plenty of physical exertion in our daily routine. I have had much advice from fellow teachers, and albeit valuable, I would also like to hear from those of you out of this league. What are your best early school memories? How did that special teacher really grab your attention, earn your respect, and demand your involvement as a working member of the classroom? Any ideas on how I could encourage them to rely more on each other to meet their attention needs, and less on me?

I adore each and every one of them but, wow.