Alberto became very interested in watching the Takus fight and felt that he should take part in it himself.
He had been a soldier in the past. However, after coming to this world, he had almost forgotten how to fight.
Most of his fights he did spend his free time playing computer games.
Although he did occasionally go to the gym to exercise his body.
Also, after coming to this world, his workload had increased a lot. He had been a soldier in his previous life, so he had very little to do with paperwork, he didn't have to worry so much about supplies, ammunition, etc. His job was to fight, to complete missions.
It was the job of the captain and higher superiors to worry about paperwork, supplies, and other things.