But there is only one thing that should shock anyone; namely the fact that it has taken so long for local authorities to recognise that personal trainers are just like any other commercial entity wanting to make use of a public park - and just like park cafe operators and event organisers they should pay an appropriate fee.
No private sports club would give a commercial fitness business access to its grounds for free. Why should our parks? And the claim that they are doing it for the good of society really doesn't wash. Anyone charging £45 an hour can comfortably afford a few bob for the public parks fund.
Given the unprecedented cuts facing parks services, green space managers simply cannot afford to continue to turn a blind eye to this kind of activity. Indeed they should now be taking a long hard look at other commercial beneficiaries of green space and the contribution they should be making - whether in cash or benefit in kind.
Take for instance, the large number of businesses that benefit from their own direct, gated, access to publicly owned and funded green space. The list includes at least one multi-national giant which makes much of its park-side location when recruiting. In a purpose-built business park, quality green space comes with a service charge to commercial tenants. Why doesn't it in our urban centres?