The buying window is a few weeks and it does not move
A disproportionate share of the year's decisions cluster into a short period, which changes when content has to exist rather than only what it says.
Interest in starting builds through late December and peaks in the first weeks of January. Secondary peaks arrive in spring and at the start of the school year, and neither approaches the first.
Content published during that window has missed it. Ranking takes time, so material intended to catch January decisions needs to be live and established well before the searching starts.
That means autumn is the working season for content, which feels wrong because the gym is quiet and nobody is thinking about it.
The quieter months are also when the less contested searching happens, from people making the decision outside the rush. Those members frequently stay longer, which makes that traffic worth more per person than the January flood.
The corollary is that January acquisition is the most expensive and least durable of the year, and a business built entirely on it has a structural problem no marketing can solve.