Cross-posting for consistency:
We generally try to be thoughtful about which features we add to our Device OS because more features means more flash and RAM used by the system and less resources available to your application. Since the primary role of Bluetooth in Particle Mesh is for device setup and diagnostics, we don’t plan to support generalized and broad Bluetooth functionality when we ship.
Particle Mesh is initially focusing on commercial and industrial uses and not necessarily health and fitness. Therefore, we don't have plans to support an additional protocol like ANT. Do you have an application in mind or just generally like ANT and health/fitness devices? Could your application be built on Mesh?