Ben,
Curious that you should mention rugby as the size and sheer physicality (a word now used regularly) of elite and near elite rugby players was in my mind while writing my post. Cricket too with how far the ball can be hit these days. I’m sure the same is applicable is other sports, or games or pastimes or leisure activities as such were once called.
Whilst there might be some sports science wizardry in concocting the most appropriate protein drink and the most appropriate amount to drink there isn’t much skill in actually lifting the glass to your mouth and pouring it in!
Bit like making chess pieces much, much, much heavier so that only big, fit, strong people can move them around the board. Kind of defeats one of the objects of the game.
Maybe it’s time to buy shares in companies that make protein drinks and the like!
Atb