Steve, I was beginning to think you'd lost interest or something...
In Phil Larder's 'Rugby League Coacing Manual' (published around 1990) he states that you should never sprint/plyo etc. on the same day as performing any leg work in the gym.
Rugby League was pretty far ahead of Union in those days but some of the training methods are bit out of date. Obviously the above statement completely rules out complex training for example.
What are your thoughts on this?