The winning 5K race time was less than 22 minutes.
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Answers
Step-by-step explanation:
That person will be able to do it in terms of cardiovascular fitness, but there’s more to it than that.
In 2012, I entered a 50km ultramarathon, with a goal of five hours. At the time, I had just run a 10K race at 41:44, and I figured, “surely if I slow down by almost 2 min/km, I’ll be able to hold that.”
Well, I couldn’t.
At around the 35km mark, my quad muscles seized up, and running became extremely painful. Every step I took involved gritting my teeth to keep going. I had to take a lot of breaks, running a few hundred metres at a time, and I finished at 5:23:40.
At no point in the race was I out of breath, so it wasn’t cardiovascular fitness. Nor was it a lack of muscular strength or power. What failed me was muscular endurance, and the only way to build that up is to do training runs of gradually increasing distance.
My training prior to the race was a lot of speed work, e.g. 400m sprint repeats on a track, and 15 km runs once a week at a fairly quick pace. What I needed to do was gradually lengthen, not quicken, my weekly long runs.
So to summarize, while someone who can do 5K in under 22 minutes may have the aerobic capacity to jog a marathon in 5 hours, that person is unlikely to be able to do it for other reasons. Keep working on your speed, but your focus needs to be elsewhere.