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I am 23 year old, and been training for 6 weeks now doing roughly 20-25 miles per week with one long run 9-11miles. I did a 5k fast run today in 19:48 but towards the end my legs felt very heavy and i dont think i could go much further at that pace, i have a few weeks before a 10k race and i want to go under 40min 10k, what training should i do so that i can keep the pace going for the whole 10k, got roughly 4 weeks to go.
p.s I managed to do the 10k 3 years ago in 40:05 with around 3 months training but cant remember what i did.