I've been taking almost no exercise for about 6 weeks due to family matters and a back problem that flared up near the start of everything. So now I am walking (but not especially fast) and cycling (ditto). However I do go out once a week with a cycling group which does around 20 miles on mainly flat terrain. However the short hills are quite steep. Last year I was never the last of the group but this year I struggle to keep up. My aerobic fitness seems to have disappeared. Once I get this back, from previous experience my legs will complain until I build them up, then back to the lungs complaining. Whatever. Anyway at the moment I am doing a six mile circular just to get my legs working, and a 20 mile route once a week for the general humiliation of being constantly dropped off the back of the group and gasping my way up hills and crying openly. After the six mile circular my BG is 6.8 (one test). After the 20 miles of torture (coffee stop included, first week ham egg and bacon special breakfast included) my BG is 4.1. After the first 4.1 I tested in the morning and my BG was 5.1. Must remember to test tomorrow morning. This all has me wondering if there is a time and intensity of exercise which gets your liver dumping and your BG up a bit, then a further length and intensity which uses up all your spare glucose stores (which then take a while to replenish). I must assume that as I was still moving with a BG of 4.1 I am probably getting most of my remaining energy from non-glucose sources. Following on from this is being permanently knackered the way to keep BG at non-diabetic levels?