For those wanting to know, yes this works in FM26 as well.
Just did a 3 year test with the test file, 20 Professionalism all phyiscal attributes started at 10 Using Quickness+Double Intensity+Rest with individual training set to quickness.
I've gotten as high as +4 in Acceleration and Pace and as low as +2 in things like agility and balance.
So it's safe to conclude that you can get the same improvements using the same training schedules.
Just did a 3 year test with the test file, 20 Professionalism all phyiscal attributes started at 10
Using Quickness+Double Intensity+Rest with individual training set to quickness.
I've gotten as high as +4 in Acceleration and Pace and as low as +2 in things like agility and balance.
So it's safe to conclude that you can get the same improvements using the same training schedules.