My BMI is 18.5. Age 24, height 172.5 cm and weight 55 kg.
I am undergoing training for triathlon. I swim 3 to 4 days a week (6-8 km in 4.5hrs - 6 hrs).
I cycle around 50 km a week in 2.5 hrs.
I run around 5-10 km a week in 30 mins - 60 mins.
I read somewhere that on an average a human being burns
377 calories per hour while swimming,
400 calories per hour while cycling,
440 calories per hour while running.
I don't know exactly the amount of calories I am burning doing all these. Invariably I want to gain weight to reach 20 BMI.
Should I eat food containing more calories? Or the muscle development in doing all these exercise mentioned will help me gain some weight?