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Yoga can be a form of meditation, and if it's working well for you that's fantastic!

The groups that I go to and the retreat that I did are in the Buddhist (Theravada/Thai Forest and Zen) tradition (with some other traditions mixed in). If I move to a new city or do another retreat, I plan to look for something in these traditions online and then try out a couple groups. Even within a single group you may be more drawn to certain teachers. I'd shop around a bit at the beginning until you find what you like. Usually the Buddhist groups are free with a suggested donation.

There are also secular groups and given my exposure to Jon Kabat Zinn, I'd recommend the Mindfulness Based Stress Reduction (MBSR) / Mindfulness Based Cognitive Therapy (MBCT) groups. Secular groups will typically require payment but it's usually pretty reasonable.