No matter how hard I try, I often wind up arching my back when doing pushups. Could somebody please give me some advice on how I can overcome this habit? Thanks in advance.
Build you core strength (back, abs, hips). This is what keeps you stiff as a board.
I don’t get mad.
I get stabby.
Stiff is not always good. LOL 
- Nexus
<font size=“1”>“Time, space, the whole universe - just an illusion! Often said, philosophically verifiable, even scientifically explainable. It’s the <font color=“blue”>‘just’</font> which makes the honest mind go crazy and the <font color=“blue”>ego</font> go berserk.” - Hans Taeger</font>
To do conventional push ups it is necessary.
If we are talking variations like divebombers or hindus, that is a different story.
I don’t get mad.
I get stabby.
Cool. You are right!
- Nexus
<font size=“1”>“Time, space, the whole universe - just an illusion! Often said, philosophically verifiable, even scientifically explainable. It’s the <font color=“blue”>‘just’</font> which makes the honest mind go crazy and the <font color=“blue”>ego</font> go berserk.” - Hans Taeger</font>
Stranger got it. Core strength is what’s killing ya.