gainer

6.0

A person who gains body weight over time

: persona que gana peso

As a committed health enthusiast, he always tracks his progress, proud to be a gainer during his muscle-building phase.
a hard gainer

I'm a yo-yo Dieter, yo-yo weight gainer.

Examples

I'm not saying that diet soda is healthy, but it is definitely not a weight-gainer!

Blog text (31)
It doesn't matter really what genetic structure you have; if you're a hardgainer or easy gainer, it doesn't matter.

Blog text (28)
He always had plenty of wet and poopy diapers and was gaining weight even though he was never a good weight gainer (and still isn't).

Blog text (13)
Many bodybuilders refer to themselves as gainers because they focus on building muscle and increasing their weight.
After starting a new diet, she quickly became a gainer, noticing a steady increase in her weight over the following months.

weight gainer

vsgainer

4.2

A person who deliberately becomes heavier to improve health or build muscle

gains weight generally from lifestyle rather than for deliberate improvement

bulker

vsgainer

8.1

A person who eats more and trains to gain muscle and weight

aims to gain muscle specifically rather than general body weight

half gainer

1 9.0

A dive in which a diver jumps forward and does a half backward flip to enter facing the board

full gainer

9.5

A dive where the diver jumps forward, flips backward once, and enters feet first

weight gainer

4.2

A person who deliberately becomes heavier to improve health or build muscle

weight gainer

3.4

A high calorie drink used to help a person become heavier and build muscle

gainer singular

gainers plural

gainer = gain (transparent) = gain + er

Standard agent/participant formation: a person who gains (weight) is directly described by 'gain' + '-er'.

Gainer comes from gain ('to get') plus -er ('one who'), so a gainer is simply someone who 'gets' weight over time.