There are many many metaphors you could use.
But you got a couple factors to consider....
Is your description in somebody's mind?
If so, your metaphor is in that person's 'voice'.
Here's a snippet.
One corner of the market was full of foodsellers and that was his goal. She watched him stride through the crowd. He expected every man to step out of his way. And they did. His clothing might say ablebodied seaman, but his confidence spoke of command. He was First Mate, she thought, or Captain.
Not a metaphor here. This description of the man's size is literal and expressed in terms of the actual behavior of the crowd.
The POV character, Jess, is down-to-earth and a keen observer of people. She analyzes the behavior of the crowd and uses that to describe the man.
Here's a description of a man's size and strength in the POV of another character, Claire.
Claire is imaginative. Her 'voice' is more poetic. Her impressions fall naturally into terms of metaphor in a way Jess' thoughts never do.
In the center of the yard, a single man stood at bay.
A dozen farmers surrounded him, like a pack of yipping terriers at a bear-baiting. The stranger hunched, elbows bent and fists ready, as they came at him. He looked like a bear himself – shaggy and dark and very dangerous.
Claire thought – at least it isn't Tom. Then she thought – I've got to get him out of here before they kill him.
What we have is a metaphor from Claire that not only describes the appearance, but the spirit of the man. The metaphor she uses is a country metaphor, describing something that would come readily to mind.
The metaphor fits the context of the story. It's time and place appropriate.
Your metaphoric description does not just fit that big strong man you want to tell us about.
It fits the time and place.
It fits the point you are making with this section of the story.
If you are not writing Omniscient Narrator, it fits the POV character as well.
You will notice that, in both my cases, the description is given,
not in terms of,
'let's stop and tell the reader how this man looks',
but in terms of
'here is something happening and oh by the way this is how the man looks'.
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