I eat 4 bananas, 2 eggs and dry fruits daily and have been going to the gym for the last 2 months, but I haven't gained much muscle/weight. However, I feel the power inside me, as I'm now capable of doing 12kg bicep curls, whereas on the first day, I couldn't even do 5kg. I'm not using any high-protein products and don't plan to for at least 6 months.

Do you have any advice on how to increase my muscles naturally?

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Do warmups and lightweights for like an hour before you workout heavy

If you're curling, move your arms slowly and not fast

For pullups, you could do some at the beginning or end of your workouts for stretching and back workout

Stay hydrated 💧

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makes sense that sweating during warmups could indicate stress release.