GET is exactly designed to support people becoming more active over time. We know that becoming gently and sustainably more active seems to be an important component in any therapy that has shown effectiveness in CFS/ME.
There are two concepts that have been explored in the physical activity management of CFS/ME:
1) An incremental approach
2) A non-incremental approach
The non-incremental approach (known as adaptive pacing , or 'APT') has been found to be ineffective at increasing activity levels: this is an approach that encourages people to stay a little below their capacity, so this is perhaps not surprising.
The incremental approach, which includes GET and CBT, have both been found to be effective in increasing activity levels. These approaches support people in gently moving beyond their activity capacity, and by doing so the body adapts to this new level.
Most people describe a slight but manageable increase in symptoms (which is entirely normal and to be expected), which then settle as the body adjusts to this new level. Post-exertional malaise therefore still happens, but at a progressively higher level of physical activity - eg if walking to the front door once caused a setback, once the body has adapted to this new level, a longer walk / over-exertion (including social, cognitive etc) might have the same response.
The idea therefore is to very carefully and progressively keep on 'raising the bar' - keeping to a level and not moving on until the body has adapted and it has become easier.
Please note that this post does not constitute individual therapy advice : specific advice to your situation should be sought in a one-to-one context with a specialist.
BSc (Hons) Physiotherapy, MCSP, PVRA, HG (Dip), MBACME