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The original was posted on /r/running by /u/drogasbadmkay on 2025-10-30 07:45:07+00:00.

Hey there,

I’ve been seeing contradictory things around how much time/effort to invest into speed work during base building periods (which I understand to be around 2-3 months for most people?).

How would the following affect base building:

• Occassional tempo runs (once every 2 weeks)
• Finishing easy runs with negative splits in the last km (something around threshold pace)
• Progression runs

I understand that the main purpose is aerobic capacity building and speed work done mainly for the purpose of muscle/technique building, but I’m afraid going primarily easy for a few months would lead to decreases in VO2 max and lactate threshold, which I built up for a HM prep the last time out.

I haven’t found an answer going through here or online, so thought I’d make a post, hope I didn’t break any rules.