You can regain 40% condition every day (5% every 3 hours), as you know already... There is no difference in gain if you train them normal or hard, or you play games, either official or friendly ones... I'll try to explain to explain using average values... Basically, 40% means you can use 13 1/3 Stretching trainings per day... 13 1/3 times 28 days in a season = 373 1/3 Stretching trainings per season... Average Stretching training range of a young talented player is 15-25, so average value is 20... 373 1/13 times 20 = 7466 2/3% skill progress per season... Distance between two stars is 7500%, so, basically, young talent can reach 1 star per season just training... But, in a game he can be Man of the Match and get free skill point... Talented players, age 22-25 can reach star in 2 seasons, and those aged 26-29 in 4 seasons... Flops (free token players from YA) get around half what talented players get at the same age...