Quick Answer: Gain up to 25+ pounds (depending on how small & weak your muscles are) in your first year and then less than 5-to-15 pounds each year after that.
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How fast you gain muscle depends on how weak or strong your muscles are
before you start working out because,
Your muscles get bigger as they get stronger meaning,
A weaker person will gain muscle faster than a stronger person.
It's easier for a weaker person to get stronger from workout-to-workout by
progressively lifting heavier weights and,
That's why weaker beginners gain up to 25+ pounds of muscle mass in their 1st year working out
but,
A stronger person gains muscle slower because,
Its tougher or takes longer
to make an already bigger muscle even stronger
by progressively lifting heavier weights and,
That's why stronger people
who've been working out for at least 6-to-12
months gain less than 5-to-15 pounds a year.
For example,
A weaker person may go from lifting 100-to-300 pounds
gaining lots of muscle
mass in their first year but in their 2nd year,
It may take the entire year for them to go from lifting 300-to-325 pounds not gaining as much muscle mass in their 1st
year.
Pictured above is Anthony Ellis of
fastmusclegain.com who gained over
20 pounds of muscle his first 12 weeks but as he got stronger,
He began to gain muscle at a slower rate by only gaining 3 pounds of muscle over the next 4 weeks.
The Weaker Your Muscles Are = The Faster You'll Gain Muscle
But this is only true for the muscles you're going to train →
for example,
If you already have big strong 19 inch arms and skinny weak chicken legs then you're going to end up getting bigger legs faster than the time it'll take you to gain another ½ inch of muscle on your arms.
The ONLY thing that determines how fast you gain muscle is how weak or strong your muscles are.