I want to break 60 seconds in the 400 but I can’t seem to do it. I am a 17 year old girl. My pb in 200m (set a couple of months ago) is 27.50 and my 400m pb (set a year ago) is 1:01.17. Any tips or training ideas would be appreciated. Also a prediction on times I could do in the 400m and 800m?