Want to keep the kids busy in the afternoons once they go back to school? We panned the after school rivers to find you NYC’s golden options, where kids will learn skills beyond reading, writing and arithmetic – think skateboarding, computer programming or nature exploration – and have a lot of fun all at the same time. Not to mention, after school programs improve students self-esteem, leadership skills and even test scores. Here are nine of the best to sign up for before classes start.

For Your Future Sports Star

You probably know a CrossFit enthusiast or two, but until now they've all been adults, right? Meet the new generation at TriBeCa's Crossfit212, which offers a kids version of its namesake high intensity strength workout. Using bodyweight as resistance (never any barbells or weight) the classes hone skills essential to kids when they run, throw, climb and jump. CrossFit coaches closely supervise all the movements to maximize safety and fun.

What: Crossfit Kids

Where: Crossfit212, 84 Franklin St., Tribeca

When: Sept. 9-Dec. 18, Tues. or Thurs., 4 p.m.

Ages: 6-10

Cost: $450 for 15-week session

Have you enrolled your kid in an after school class for fall? Tell us all about it.

–Anna Knoebel