went into a three-point stance to test how the arm was coming along.

[svetlana14]

He put his knuckles on the wet tile, went into a three-point stance to test how the arm was coming along.

What is the meaning of went into a three-point stance to test how the arm was coming along?

come along | meaning of come along in Longman Dictionary of Contemporary English | LDOCE

come along meaning, definition, what is come along: to be developing or making progress: Learn more.

www.ldoceonline.com

Examples from the Corpus

 

[5jj]

Three-point stance - Wikipedia

en.wikipedia.org

 

[svetlana14]

Three-point stance - Wikipedia

en.wikipedia.org

But is it possible to imagine how the arm is coming along in this position or the context is not sufficient?

 

[5jj]

You can see how the arm takes the weight.

 

[emsr2d2]

But is it possible to imagine how the arm is coming along in this position or is the context is not sufficient?

Remember to use the correct word order for questions.

 

[SoothingDave]

But is it possible to imagine how the arm is coming along in this position or the context is not sufficient?

It states that his knuckles touched the tile, and mentions three points (of contact). Knowing American football makes the idea obvious, but there are enough clues that you should be able to figure it out regardless.