Kid's Need to Stay Fit

I have two boy's ages 2 and 5. It's important that they stay fit. Mica my 5 year old has a program with one of his preschool's (he goes to 2) that is called Stretch and Grow. They teach Mica exercises as well as good nutritional facts.
A Giveaway Addicted Mommy is giving away an 18" hop ball from Aqua Leisure/First Fitness.

This is some information from Aqua Leisure/First Fitness website:

Getting kids up and active is the main goal... and FirstFitness offers a wide variety of products tailored to do just that. Each fitness item target benefits in one or more of these six key areas:

• Cardio: Increase heart and respiratory health and stamina.
• Strength: Helps stimulate healthy muscle growth.
• Agility: Teaches body awareness and balance.
• Performance: Aids and enhances child's exercise performance.
• Flexibility: Keeps muscles and joints functional and safe from injury.
• Skills: Develops the basics needed to do well in sports.