Gaining weight

… it’s extremely hard for me to gain weight…

Can you elaborate on this? Perhaps describe some of the things you have tried to gain weight…

Your maintenance calories - how many it takes to maintain - will increase with your weight. You need to constantly recalculate that/steadily increase how much you're eating.

You need 3500 calories above maintenance to gain a pound.

Ruben463 wrote: »

I have tried eating a maintenance calories in a slight surplus but it still hasn’t been working I’ve gained 15 pounds because I was at 115 but after that I just stopped

Maintenance calories = maintain weight, so you can't gain weight at maintenance.

As mentioned above, you need 3500 calories above maintenance to gain 1lb, so perhaps your slight surplus is too "slight. More calorie dense foods like oils, butter, cheese, nuts etc. may help. Bottom line, you need to eat more or reduce activity.

you are doing intense calisthenics, football and weightlifting dont expect a slight surplus will make a differnce, since you weight is maintained that's probably your maintenance calories, try to add 500cal or more and track your weight for couple of weeks. if your weight still maintained then calroies dense protien shakes like SeriousMass could help. not saying you should take them, only suggesting