Motivation is the reason why someone acts or behaves in a certain way. There are internal things that motivate us, like doing an activity because we enjoy it. There are also external things that motivate us, like being rewarded with praise or prizes. Knowing what motivates kids is a good way to keep them interested and engaged in activities.
Kids differ in what motivates them. For example, some kids might be very motivated by the sense of achievement in improving how they kick the football, and will happily practise kicking for a long time. Some kids might be more motivated by socialising, and will be more interested in talking with other kids rather than practising footy drills. Other kids will be very motivated when tackling a big challenging task like learning a new skill, whereas some kids might be disheartened by challenges like these. Knowing what motivates each child and what they find rewarding is important for coaches to understand.
Kids who lack motivation might look disinterested or bored. They may not follow through on instructions, and they may need a lot of encouragement to get involved.