Yes power training as u call it much more profitable on young players..but players over 24-25..there is not point in that really
the best way is personal trainer..

Ive once played 36 friendly games and full training for about 14hours straight..i did not keep check how much of an improvment they recived

but 4-5quality in 2 days sounds to good to be true..gotta try it out.. play constantly and power train for about 4-5days..ill update my progress
as soon as i find a 18 year old st with one vs one