You slept 6h 12m last night, lighter than you'd like, and your HRV is still under baseline. Your legs feel strong, but your nervous system is still clearing Sunday's long run — so today's about easy aerobic, nothing that digs deeper.
Here's how I'd shape the day, based on your sleep, training load and where you are in the plan:
Aerobic base at a conversational pace. Keep HR under 142 — if it drifts, slow down.
Within 30 minutes of finishing, to kickstart repair while your body's primed.
You ran a fluid deficit yesterday — steady sips keep recovery moving.
Lights out by 22:30 — bank the sleep your nervous system is still asking for.
You logged it as Zone 1, but here's where the 52 minutes actually landed:
That drift into the middle is the most common pattern I see in your easy days — it feels productive, but it quietly taxes the recovery your one hard session this week depends on.
The polarized model only works if easy is genuinely easy. Keep the slow days slow so the hard days can be truly hard — the middle zone is where most endurance athletes leave adaptation on the table.
Today is an easy day, and it should feel almost too easy. Keep HR under 142 and hold a full conversation. This is the 80% that builds your aerobic engine for the 100K.
Per Stephen Seiler · polarized 80/20 · easy day
Within 30 minutes of finishing, while your body's primed to restock. Oats with banana, honey and Greek yogurt covers carbs to refill the tank and protein to repair.
Kick off the day's 2.5 L target right after your run. Add a pinch of electrolytes this morning since you sweated through the 70 minutes.
A quick effort rating helps me confirm you actually stayed easy. If it felt above a 4, we eased too little.
Keep restocking for tomorrow's hard session. Rice or potatoes with chicken and greens — slow carbs so you're fuelled, not heavy, for the rest of the day.
On track for 2.5 L. Steady sips through the afternoon, not big glasses at once.
Easy days aren't filler. They're when your body absorbs the hard sessions. Stay off your feet where you can and keep the legs fresh for Thursday.
Per Stephen Seiler · easy days enable hard days
Thursday is your one genuinely hard session this week: 5 × 4 min at threshold. It only delivers if today stays easy, so we keep the contrast sharp.
Per Stephen Seiler · the 20% that drives adaptation
Recovery between hard days happens in your sleep. Aim for 8 hours tonight so Thursday's session lands on fresh legs and a fresh system.