Fighting does not demand only big muscles. Sometimes you have to think before you rush into the crowd and hit them where it hurts. The enemy will be even more weakened and you can finish it.
In fighting games and combination games, you'll have to use your brain to create combinations of symbols to cast spells on your enemies. Sometimes these games are played in turn and the enemy can also make combinations. In other games, you are the one who makes combinations, and you should do as much combinations as possible.