Brief Answer:
It's good to have Hdl at least more than 40
Detailed Answer:
Hello XXXXXXX
I am Dr. Mody and I would be addressing your cholesterol.
Hdl is the Good cholesterol, so higher the value better it is . For males it should be more than 40 ,
So 51 is considered Good and is a reflection of the beneficial effects of exercise, as during exercise the cholesterol stored in fat is mobilised to liver and muscles for production of energy ( what we call burning of fat ) , This is a reverse cholesterol metabolism which is through Hdl.
Hopefully this would resolve your doubt .
Do rate for others reference.
Regards Dr. Priyank Mody