My 6 year old loves his running program and I see a fair number of kids who don't love team sports there. They do individual activities, like quick sprints and longer jogs, and the coaches have them work together and build team spirit in other ways.

Track, swimming, gymnastics are all good individual sports for kids.

Rock Climbing Clubs - many indoor rock climbing facilities offer that now.

I am a huge fan of martial arts. I love that they provide great physical exercise, but also promote and support important life skills like discipline, confidence, and respect for self and others.

Tumbling. Hardly (if at all) competitive unless you want it to be. It can also be about age-appropriate and coach-assisted cartwheels, strengthening, flips and fun.

Yoga has been really fun for my kids. I feel that it's good for their physical and emotional health, and it's nice that they can do it together even though they're three years apart. It also doesn't require any commitment beyond the weekly class and can easily be worked into our schedule - no games, recitals, etc!

Ninja Warrior/ Boot Camp/ Kick Boxing/ Cardio Classes. Unique kids schedules are often found at specialized, local adult gyms now.

Girl Scouts or Book Club