This is my first draft, It's pretty bad I know, But I would like to see about making it better.
Here's the thing: what about this idea is supposed to be interesting? It's a dumbbell that makes your muscles grow faster than they are supposed to. It's a straightforward amplification of an existing effect. The object isn't even visually distinct. Are you looking for a better draft of this idea? I don't see that happening, simply because this particular idea is so sparse. Are you looking for a better idea involving dumbbells? Then my suggestion would be find a story you want to tell through your object; find some aspect of weightlifting that you want to explore with your scp, and you'll have more success than turning household objects into magic items.
I sing of arms and the man
Storm-tossed by Hera's jealousy
Oh, never mind.
Okay, does everyone see this? This is the exact circumstances under which a line-by-line quoted review is not appropriate. You don't have to hide a huge-ass post behind a collapsible just to correct a bunch of spelling, note that there's Imperial measurements, and express that you don't understand the reasoning behind some of it. There is no need for this.
When you line-by-line review something this way, it's either going to come across as condescending, be too long for anyone to actually read, or both. As the Rules post says, BE CONCISE.
Conceptually, this is a poorly done OTT object: Something that does what you would expect it to do excessively well. As the Cliché List will inform you, this isn't something easy to pull off even when an article is well written, leave alone when it's not.
All expungement here goes against what is advised in this guide.
Unfortunately, the advice above won't matter anything unless the biggest issue here is addressed: Execution. It is completely understandable that newcomers may be unfamiliar with the format and tone used at this wiki, but proofread is something that doesn't require you to have any experience aside from reading what you're writing, and\or opening a text editor and letting it highlight what's wrong with your text.
Posting a draft like this, full of typos and awkward paragraph breaks, leaves the awful impression that you don't care about your own article at all, or expect your readers to fix everything that is wrong with it for you.