I think you got me a little bit wrong. I meant that you can change training regime week by week without any training "score" being dumped in the process but you cannot switch training midweek, because training occurs Friday ONLY! The engine computes training performance based on the training scheme that is set right before training deadline on Friday.
Also, if you are concentrating exclusively on getting the most out of your training, it's no use giving your guys more than 48 minutes a week. Every minute more than 48 doesn't affect the output at all. So instead, you should put some backup dude or any other guy to get his training, even if he is not listed at the position you are training.