Hey i am 15 5'10'' and around 133 lbs, was considering doing GOMAD or some kind of mass gain diet for about 2 months. Routine is gonna be 5x5 plus some swimming and agility work hoping to gain over 15 pounds in 2 months and wanting it to be at least (hopefully more on the side of muscle) 50/50 ratio. not wanting to lose all of speed and agility. Also wondering on how many carbs/ day i should take in on this, input would be helpful. Goals are to get a bit bigger to not get crushed playing linebacker next year in HS
I'm a 28 year old 5'5'' male. Last year I managed to shoot up from ~128 to ~145 between August and December, so approximately four and 1/2 months. I did this with with 120-140g of protein per day and filling the rest with approximately a 5:4 ratio of carbs/fats (while trying to keep it as nutrient dense as possible, the carbs were really a SHIT TON of cooked vegetables with some honey and berries at night). My training was a 5x5 of solely compound movements (i.e. deadlifts, squats, bench press and weighted chins).
I managed 18lbs in that time, but you're 15. I wouldn't surprised if with the right stimulation you managed some good gains. I am not sure about 15 lbs in 2 months, but you can definitely make excellent gains by that deadline and then just keep going.