Good day i am an active cyclist and have been cycling over a period of 30 years. i cramp severe during races wich is frustrating. i have done the magnesium/calcium route, went to a sport specialist who gave me stretching exercises , watch my diet etc etc.

Diet or form factor?: First, congratulations on lifelong commitment to fitness. Cycling for 30 years is awesome. Second, given the changes that can occur with work, play or just the passage of time, it might be a good idea to see a physiatrist or exercise physiologist. Someone with expertise in diet, position and muscle function (and dysfunction) might wish to do motion capture or other tech and medical/diet evaluation.