If there are eye problems (retinopathy) - exercise should not be allowed till retinopathy is corrected.
If there is nerve damage (neuropathy) in the foot - Avoid running, jogging, or cycling. Advised only to wear prescribed footwear.
If there is damage to the nerves that regulate internal body function (autonomic neuropathy) - physical activity should be avoided as there may be risk of developing dehydration or low blood pressure.
If the high blood pressure (hypertension) is high - avoid resistance exercises.
Some undesirable effects that may be related to physical activity include
Increase in the amount of protein in the urine,
Increase or decrease in blood pressure during exercise,
Fluctuation of blood glucose levels,
Increase in ketones in uncontrolled diabetics.