Is Apple Series 3 watch good for steps?

I have a pretty accurate app that counts my steps daily for when I do walks etc.
I put my phone in my pocket or if I go on the treadmill I use the armband & put it around my leg.
Its annoying having to sometimes hold my phone while I do other exercises.
I've been looking at the watches that count your steps.
With the Apple Series 3, does it pick up your arm movements?
Eg, if you put your hair behind hair or pick up a plate or put things in your bag?
I do want one of these watches but to me if it does use those as part of your step count it’s cheating.
Does anyone who has one notice this?
If it does this, I will prob leave it.
Is Apple Series 3 watch good for steps?
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