Trust me. Exercising is not enough.
I ran 40-50km weekly also cannot bring down my LDL from 4.8 mmol/L.
It's the diet that brought down my LDL to 2.8 mmol/L.
true, effect of exercise only contribute a small fraction
next best if diet, at least double that of exercise.
but bestest unfortunately is medication
so if no sickness, watch your diet, especially saturated fats in fried stuff and all meat except fish.
one myth about seafood especially shellfish like prawn has high cholesterol but this dietary cholesterol may not contribute to LDL
Fish you have to watch out mercury, if the fish happen to eat meat

, like shark or even certain type of tuna