I've recently started running a bit more seriously then before, and has been preparing for a half marathon(21k spartan) for the last 8 weeks or so.
I can easily run 10-14k, and managed to force run to 19k once before.
My question is, right around 12 to 14k into the run, and this is fairly consistent, I get an annoying pain right inside the ball of my feet.
This is not specific to any one area but a more of a burning sensation in the ball of the foot.
This is happening in both of my feet, and if I raise them up it goes away.
As if lactate is building up and causing a swallowing.
I managed to get to 19k by raising my feet up every 1-2k, and really pushing the pain away.
I've tried changing my shoes, minimalist to 12mm drop shoes, slow pace running, different size nothing has worked so far.
I really think this is the only thing that is preventing me running long distance at the moment, so I really appreciate any suggestions.