Other than me not reading massive or any other word, HotButton summed up my views.
I have no opinion on whether it’s appropriate for the purpose at hand because I have no idea what it’s supposed to represent.
The chevrons look like a corporal’s insignia and the words look vaguely military or collegiate. However, what you’ve done with the chevrons in the bottom two examples probably isn’t appropriate if you’re after a military look.
For that it’s worth, there is considerably more space between the S and V than there is between the other glyphs. In other words, adjust the kerning.
You can’t determine kerning that way. You need to determine it visually. Good letter spacing isn’t a matter of measuring distances. It’s more a matter of optically adjusting the volume of negative space in relation to the positive in a way that creates an even color.
Here’s an extreme example. The top word below has approximately the same distance between letters. The bottom word is optically adjusted.
From a purely artistic or aesthetic point of view, I like the first one best. For that matter, it looks pretty good. However, I think it conveys something other than what you’re hoping to convey, which is probably of equal (or greater) importance than how nice it looks.
I like your idea of visually implying weak-to-strong, puny-to-beefy, or small-to-large. However, you can do that using only typography without needing to confuse the issue with something that conveys a military look.
I’m not suggesting that you do the following, but I am suggesting keeping the basic idea of growth while figuring out how to communicate both the name and the gym’s personality in ways that don’t contain unintentional connotations and confusing ambiguities. People need to be able to read the name (which I couldn’t) if you’re using it as a word mark.