Sport development gurus familiar with the growing mountain of research surrounding athletic expertise have a hard time reconciling the time necessary to accumulate thousands of hours of deliberate practice with the negative effects of specializing in a single sport at too early an age. The literature largely ignores this conflict but luckily the big brains at Sportkid Metrics have considered this and we think we have a solution that resolves this problem.
Very good thought stimulus.
The sports that this applies to especially, in my opinion, are tennis and football.