One other point which I think might be of interest to younger coaches – I fell into this trap too…. might still be guilty of it!
If you need to improve a variable (speed/strength/endurance) you’ll often go to a source (book/papers/coach) and learn from them – but the MOST important thing to bear in mind is that you can only apply a little of it to team sports (Rugby/Soccer/Football).
It’s back to that word again – balance.
I’ve fallen into the trap of being influenced too much by certain areas and then my training reflects it and then my athletes do. Maybe it’s just part of the learning curve.
When all you have in the tool box is a hammer – everything looks like a nail!