They should be ok... once you get used to them being there... same with a head torch which some prefer as it can light up where you’re going to run rather than dead ahead all the time. I’ve avoided both so far, and my daughter is going to hit the dreadmill at school two days a week to keep up.
I have yet to find a perfect one.......avoid anything that stands away from your head too much......wobble..........one of mine required hard to find rechargeable batteries..........some have annoying flashing function.........useful to have a red rear light if on roads......... probably worth paying more for decent reliable quality.
I have a kalenji chest light from Decathlon with flashing light on the back. I find it comfy as it's very adjustable and it lights my path really well. I think it was about £20 a year ago.
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