I know that feeling,I'm currently (last 3 months) doing MAF (Maximum Aerobic Function) training. Basically 180- your age gives your target HR and you try and run at that or below mostly. Has worked wonders for me really enjoy?ing it. Slowly getting my 10km maf time down to 1 hour (currently about 1 hour 3mins). Every now and then I do a "fast" parkrun, I did one at the weekend around 23:11 but my heart rate never went above 157 but averaged at 143. For me that's a great time and I was oddly not out of breathe at all was very much limited by my legs not knowing how to go any faster.
Anyone else tried MAF ?
I think MAF is essentially zone 2 training. I will give it another attempt and try the "shuffle walk" .
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