Dr Aileen Alexander, a registered GP and women’s health expert at Nourish, puts forward an alternative theory. “SSRIs can reduce daytime fatigue and cause difficulty sleeping. Additionally, some SSRIs can cause abdominal upset, which could be problematic during runs.”

As with any class of medications, however, “responses are individualised” and according to Dr Alexander, “it also depends on the specific type of SSRI and dose prescribed”.

Given that highly individual experience, it’s not surprising to learn that some people find exercise easier when taking SSRIs – and not simply because untreated depression can leave you feeling like it’s impossible to move at times. There’s some evidence to suggest that these antidepressants may decrease the perception of pain signals, which could lead to improved performance. Given how complex the brain is and how relatively new the field of mental health science is, it’s probably safe to say that we just don’t know why people can take the same medication and have different experiences.

Faced with a future of awful fitness experiences, I considered ditching my medication or hanging up my running trainers for good. Clearly, neither is a good idea but Dr Alexander is quick to warn against coming off medication without speaking to your GP first. “It’s important to note that SSRIs are prescribed medications and should never be stopped without discussing with your doctor.

“I was training for a half marathon before I started taking antidepressants – why does running now feel so much harder?”