 For Brooklyn Dene, it's made a big difference. They're really fun and I get to learn a lot. Discipline to always keep trying and never give up. Black Belt Carlos Raba is the co-founder of Guardian Baltimore. The non-profit offers free classes five days a week to kids 6 to 17. Ages 6 to 9 at 4 o'clock and then at 5 o'clock we have ages 10 to 17.