WARNING - this is an advanced exercise and requires a very high exertion level. DO NOT attempt if you are untrained. If sprinting is new, start with...
In my green smoothie experience. I initially had discomfort. My guess, too much fiber in one drink. I dialed it down the next few times, (volume and...
when I was struggling with recovery issues a runner friend recommended "base training" low/med heart rate for long time/distance, for me at the time...