Trigger word(s):

Basic trigger word is:

thick legs

To strong effect:

thick legs, chunky legs, thick calf, athlete legs,

Trigger words for a bit muscular legs:

thick legs, muscular legs, 

For chubby legs:

thick legs, chubby legs, chubby,

Additional words for specific body parts will work as well:

muscular calf

muscular calves

muscular thighs

athlete calf

atlete calves

athlete legs