Is going to gym to build some muscle weight the only solution to increase weight? Because I've tried other methods and the only thing I've not tried is building up muscle weights. Does it actually work? Anyone experienced this before?

Age 20, weight 45kg, height 170cm. BMI 14~15. Super underweight.

Planning to take supplements. But need recommendation!

Like all the other troubled people here, no matter how much food I take in, it will have no effect on my body weight.

I'm a working person and I have only weekends to exercise. So my question is are there any supplements that can help me gain muscles but not fats, without going to the gym? I usually jog in the park every weekend.

Please help! Thanks!

Must be gym ah? If work out at home like sit-ups push-ups 20 times each will it be effective? Really busy especially in audit line...

And what's the quotation for a mass gainer? Any brands in particular? And how's the frequency of intake? Twice/Thrice a day?

And thanks for replying!