@fastt10in r/Sprinting β’ Recommends
On βDo biceps and abs help you when sprinting?β
Let's start from abs.
Your core is really important when it comes to sprinting, but crunches won't translate much into better truck stability when running.
So my advice is to watch this video to understand what you need to focus on.
link to this video
Biceps on the other hand won't do much on your running in general, so if you'd like to get bigger arms just go for it, it won't make much of a difference.
Other upper body exercises like bench press and overhead press are going to help you be more explosive tho.