Gym: it grants a boost to the cross-training.Practical example: while training Passing, more or less 10% of the points earned from the single session is given to a random skill, randomly chosen from the ones that are not directly trained. The Gym grants some more points to this bonus, supposedly without taking away anything from the direct training.- Level 3 apparently doubles the amount of decimals given to the cross-training (from 0.030 to 0.060 points to the random skill)- Level 1 apparently grants a +30% of decimals given to the cross-training (from 0.030 to 0.040 points to the random skill)