I am sure all avenues have been investigated in relation to Brett's ongoing calf problems/strains . Strengthening the core , lower back , glutes and hamstrings . Orthotics and body alignment , acupuncture , massage , running technique ( a hard one to change ) etc .
Something that is occasionally overlooked is the importance and especially in ageing athletes of supplementation .
I suggest Magnesium balanced with Calcium and Zinc - taken morning and night on top of a good daily multi vitamin and mineral to be taken at lunch and
L-Glutamine - 5g x 3 times daily .
Also potassium levels should be considered important to prevent cramping if that is a problem .
If very fatigued with sore muscles i have found 5g of L-Glutamine with a berocca in very cold water works wonders as an instant revitalizer for energy and vitality .
Obviously supplement levels should to be monitored or advised upon by qualified professional .