Within the space of a few hours, I've been plunged into a bathtub of ice, had some unflattering headgear with electrodes attached to my head and had my blood removed, mixed with oxygen ...

To be fair, you certainly get bang for your buck, though I did opt for some extras (at a cost), such as an ice bath (£125), Thai massage (£140) and brain-boosting transcranial electrical stimulation ...