Two-time Olympic boxing gold medalist Claressa Shields says she not only appreciates some recent advice from Conor McGregor , but she’s using it in the gym ahead of her MMA debut. This past December, McGregor commented on an Instagram post featuring Shields’ MMA training at Jackson Wink MMA, and the former UFC two-division champion had some pretty in-depth recommendations. View this post on Instagram A post shared by ESPN MMA (@espnmma) Teach her balancing on the single leg first! Warm up / warm down for EVERY session – Pick the single leg and move her around. Elevate the leg high.