Is training is can increases the stats?

Im really confuse i skip weeks almost 20 weeks but the stats didn’t change at all i mean it change but only the fitness

Not sure what you’re asking. The fight camp increases/decreases in stats are only for that individual fight. Attribute increases can happen outside of fight camps via training, but they are uncommon.

The best way to increase your fighters’ attributes is to fight them often, getting them xp and putting it towards important stats.