Thank you @Gigia. In non-Covid times I enjoyed swimming, but my muscles have gone to pot in lockdown, I will check out your recommendation.
Avoiding bread is hard, @SchrodingersImmigrant, as I do really like it. What I've done is frozen individual slices in freezer bags from a good quality wholemeal loaf so that I can allow myself a slice as a 'treat' now and then but it has to be considered (i.e. defrosted!).