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Winter sports generally require massive lower body stablity, carrust.
Your bum is the biggest muscle group in your body, and makes a big contribution to lower body strength.
Mine gets a regular workout from running on the beach ... plus I work it at the gym.
You can tell people who have good core stability. Even if they are not very heavy, when you push them, they feel as though you can't push them over. That's down to glute and abs conditioning. Nicola looks about as stable as they come!