Tennis Lessons/ Spanish Lessons/Enrichment Activities for kids

I am going to be in Medellin for a few months and am looking for classes to keep my 5 & 8 year old active and entertained.  Does anyone have any ideas for places we could enroll them in tennis/spanish/art/stem classes?  Thank you!

Investigate "Expats in medellin" (Or something similar) on Facebook.  They have a group that should be able to answer more specific questions about Medellin  This forum members are from all over the country.