How to hold iPhone whilst using Runkeeper app?

I use the RunKeeper app whilst out running and walking. I was wondering how you hold it, in your hand, attached to your arm, attached to your waist etc? I run with my phone in my hand, is that okay?

I have the Nike Running app - which I assume is similar. I have bought an arm strap to hold my iPhone in, and it counts my arm movements into distance. Before I had this I just used to hold it but the distance is not as accurate when you hold it. I got an arm strap from eBay for £2.99. Hope this helps:-)