DBC grad here (Chicago 2013). Mandatory morning yoga is not an inherent part of a generic coding bootcamp experience. DBC chose to make yoga classes part of its unique culture, but I doubt all other bootcamps follow suit.
Personally, I wasn't "enraged" by the yoga and I even appreciated the emphasis on mental health, but I don't think yoga was the only way to achieve this and I would have appreciated the chance to opt out.
