I’ve heard tempo/threshold long runs are bad. Is this accurate? Because I tapped into threshold today during my 12k long run.

Why am I having such a huge spike in heart rate at 10-11 minutes into my 5k. It’s happened twice now but the effort between before it spikes and after feels the same. Is it that I’m hitting the lactate curve? Or is there another reason?

Is there any way to keep building/maintaining aerobic base while sick?

Finally felt great and training is paying off. Probably could have gone a little faster at the end but I knew I was going sub 20. Also I didn’t mean to lap it at .15.

Practice meet for cross country. A lil shy of a 5k but still an impressive time improvement from last year. Came in like 5th but it was just our team.