This week's question comes from a club runner whose coach thinks that cooling down defeats the object of speed work. Our correspondent isn't so sure. Let's just say that you knew where you stood on this one, and it wasn't with the coach..."I wonder

sessions were useful for ultra endurance. Obviously you don't run ultras anywhere near threshold, but raising the threshold means you are operating further from it. So even if you work at the same heart rate, you're working at a lower percentage of it

and then turn purple after 10 minutes, but I've just learned to pace myself somehow. Running with my friend helps. I push the pace and she pushes the endurance, so we're a good team. We're trying for three runs a week now: one fartlek/pace run, one strength run

because it seems to have some acupressure-type effect. – Bear B. HindUnfortunately every Friday it's part of my job to run with a 15kg bergan. This training is good for building endurance and core muscles, but if you don't build up to it you're gonna get

, and partly for general health reasons. But I feel sluggish and my work is suffering. Is there really a point to this caffeine-free lark?" – Jane Hoskyn aka e17 pixieYour best answersResensitising really works, so brave it outI abstain from caffeine now