choose a suitable kind of exercise within your own ability;
exercise in an environment with good ventilation and suitable temperature;
put on suitable sportswear and sports shoes;
do not make any drastic or abrupt movements, particularly when the exercise involves the neck, waist and knees;
breathe naturally while doing exercise; and
if you feel unwell when doing exercise, you should slow down or take a rest, if the unwell condition persists, you should consult your physician for safety sake.