Why are my arms so tight and locked up?

[Anonymous]

After push-ups

[DanoM1]

I'm a PT ;)
In easy words, they're sore after exercising and that follows up by them growing.
With more detail, there's a part of the muscle (fascia) that pumps blood to it and grows when it pumps "a lot". This makes it grow and it doesn't naturally "shrink" again. After a few days, it gets used to that position. Understand?
To help you out, have some isotonic drink or fruit rich in sugars (these sugars aren't bad for you).

[ilivealive]

because your muscles are under stress and want to remain under that position until the body cools down

[MsHeidi]

Maybe you are not used to it yet... or you reached your limit... or you're not using the right technique

[Asker]

Yeah extended my body up and almost face planted

[MsHeidi]

Give your body enough time to recuperate..

[Asker]

Well it was 5 sets of 25

[Casstiel]

Blood pumping things I guess.