I use every day:
2 x stretch
2 x video analysis
2x x skill drill
thats a condition drop of 4.5%
I do that twice - hopefully you have the x2 video you can watch to double the effect too.
That usually does it, but if not just pick the players not at 10% and train them with drills for their roles - you will need to have at least 4 for an attack/defence bonus, and 8 for a physical & mental one.
Hope that helps