After sitting and playing in a classroom all day, children need exercise. Relaxing at home watching tv and playing board games is all great, there are 5 days after school and all weekend to fill and children age 4 should be having 2 hours of exercise and activity a day.
I am sure that c.shallow was not intending her son to be spending 5 hours every day after school doing an intensive course of activities.
At that age, it is important to expose children to all sorts of different things so that they can find out what things they enjoy.
My kids have always attended activities both before and after starting school.
That does not mean that we don't spend time playing games or relaxing.
At 7 and 6 they go swimming, to judo, beavers, general sports club and have in the past also gone to football (swapped it for judo) and rugby.
They both play chess well, have asked to go to art classes, the eldest is learning the guitar from my husband and I can assure you that they can both spell.
However, they both still get to play on their station, watch dvds and read intensively everything from the beano to harry potter. They also have friends round to play, go out on their bikes etc.
It is not a case of one thing or another, it is possible to do family activities and outside clubs. I am sure that if c.shallow felt that her son was tired either before starting or after starting activities it would not be something she would be considering or continue with.