if I'm determined to increase a player skills....

[redsnoopy]

....is it better to all out training or a mix of matches and training ? Assuming I've a normal stream of rest packs

[Leavemyarselona]

Play in competitive matches, and all out training.

[Cat Harrison]

Well... if you are wanting to power train a player, do a few trainings at each intensity and see which one the player does more above average, on average, and train that intensity/training for best frugality of greens.

[duchao]

if you want to train, you should strengthen friendly match, the index increased rapidly.