Speaking as the unemployed wife of an OAP - we can't afford gyms or fitness equipment. Even the 'cut-rate' discounts would add up to too much for us, especially when you factor in transportation costs.
I wish the NHS would offer some kind of 'basic plan.' Diabetics, hypertensives, people who are morbidly obese, etc. could all benefit from some kind of free access to fitness suites / classes. It would be an ideal preventive measure if people hadn't yet begun to suffer from some of the secondary conditions, thereby saving the NHS money / resources over the long haul. And if people do have some of the concomitant conditions, they could begin addressing them with exercise.
With the new move to slash the budget even farther, tho, I don't think there will be such a program offered, at least not in the foreseeable future.
Shame, really...