Hi EmmaKB
I did soccatots when DS1 was about the same age, so can offer a few things to bear in mind.
It was geared to slightly older kids with a bit more understanding of sharing and activities with a beginning, middle and end. It starts with a warm up and some weeks the stretching, leg lifting etc that they do had held all his attention adn he couldn't concentrate on the rest of the session.
Quite a lot of the 'tasks' were way beyond him, like kicking a ball through bean bag markers - toddlers caused chaos by just running off with the bean bags and dropping the footballs also 10 star jumps followed by free kicks at goals: chaos!
He did seem to enjoy it, though he never really got involved with the warm ups and his fave time seemed to be kicking the ball around with his pals at the end. Thinking about it, the most enjoyable sessions were when a few of his pals went too.
In the end, we realises it was great to get him out the house with dad for a bit of quality time, so after a few weeks said dads and boys got together for a kick about, had much fun and saved a fiver.
Hope this helps