Xertion Trumps Power Nap Every Time

Skip the Power Nap: Why a 14-Minute Sprint Workout Beats the Afternoon Slump Better

At 3 PM yesterday, I had a rare energy slump. That doesn’t happen often, but I was tired, my brain was slowing down, and I was tempted to take a power nap, so I went to a nearby parking garage instead because I know about some science others might not be aware of (which I will share with you now).

I started with sprints up 4 floors of stairs to warm up, then 7 progressive sprints up the parking garage inclines with 1.5 min rests between each sprint, building from easy “form runs” to 100% all-out effort and speed.

Total time: 14 minutes.

Heart rate peak: 160 (my calculated “max”).

Brain fog: gone.

Energy: boosted immediately and for the rest of the day.

Productivity: skyrocketed.

Mood: elevated.

Motivation: peaked.

Here’s why that short, hard effort is more energizing than a 40-minute “power nap” for the afternoon slump — and exponentially better for getting fit, strong, and lean (versus fatter and weaker by choosing the nap option).

The afternoon slump trap

That dip at 2- 3 PM is real. Core body temperature dips, sleep pressure builds, focus tanks.

A nap feels like the fix. The problem:

Long naps leave you groggy
Long naps steal your sleep that night
Naps do zero for fat loss, fitness, or leg power

That’s why I sprint instead.

What the newest research actually says: workout = nap for memory

August 2026: McGill researchers kept 54 healthy young adults awake for 30 straight hours, then split them into 3 groups: 20 minutes of moderate-to-vigorous cycling at 80% max heart rate, a 90-minute nap opportunity, or just sitting on a bike doing nothing [1].

Three days later, they tested memory for images seen right after the intervention:

Exercise group: correctly recognized 56%
Nap group: 57%
Control: 46%

Both exercise and nap performed about 21-23% better than doing nothing. There was no significant difference between exercise and napping for protecting memory [2].

An earlier lab study found the same pattern — short-term exercise and a nap improved recognition memory over a nap or exercise alone [3].

So I’m not saying a workout replaces sleep. No workout does. The researchers are clear on that. I’m saying when you want to save time, or don’t want to wreck tonight’s sleep, short vigorous exercise gives you a real cognitive backup plan versus a long nap. It does save time, and time is NOT a renewable resource, so smart people guard it as best they can!

3 reasons sprints beat napping for energy

1. No sleep inertia

That groggy, disoriented feeling after you wake up has a name: sleep inertia. It’s associated with significant cognitive performance decrements that take time to clear [4].

Long naps make it worse because you wake from deep sleep. That’s why sleep experts say to keep naps to 10-20 minutes to avoid deep sleep [5]. Most people nap longer than that, though, and the resulting inertia is real (and wastes even more time after the nap).

Even a 30-second burst of exercise (Xercise Snax) was shown to reduce subjective sleepiness [6].

My protocol skips inertia entirely. You finish the last hill sprint wide awake, breathing hard, legs buzzing — not stumbling to find coffee to wake up.

2. You protect tonight’s sleep

This is huge at any age, but especially after 60, like me.

Regular physical activity helps you fall asleep faster and improves sleep quality [7]. Evening exercise doesn’t wreck sleep either — it helped most people fall asleep faster and spend more time in deep sleep [8]. I emphasized the word “most” there because some – like me – shouldn’t exercise within 3 hours of sleeping, but most are the other way. You should run your own experiments to find out for yourself.

A long (60+ min) late-afternoon nap does the opposite: it bleeds off sleep pressure you need for tonight.

I sprint at 3 PM; I’m tired at 9 PM. I nap at 3 PM for 60-90 minutes; I’m staring at the ceiling until midnight. So for a fast energy boost that doesn’t cost you that night, exercise wins.

3. Naps don’t make you lean — sprints do

This is the exponential part.

A nap burns nothing. It only further reduces your metabolism for that day. Sprint interval training is one of the most time-efficient fat-loss tools (and metabolism booster) that we have:

Sprint interval training was designed specifically to test time-efficiency for reducing abdominal visceral fat [9]
Sprint intervals can increase whole-body fat oxidation up to 26% while exercising [10]
Sprint training increases testosterone (yes, in women too), which helps build muscle and burn fat.

You get alertness PLUS quads, glutes, calves, heart and lungs, and a fat-loss stimulus. Try getting that from a pillow.

My exact parking-garage protocol from the video (below)

This is what I did — incline sprinting is the main event; stairs are just the warm-up:

Warm-up: sprint up the stairs 2x for 4 floors, taking the elevator down (best) or walk down (if no elevator). Now you’re warm and ready.

Pick a ramp or hill you can sprint 10-15 seconds. Mine is the parking garage ramp.

5-7 progressive runs, about 1.5 min rest between:

Form run — 60%, tall, relaxed arms
Build — 70%, push a little
Fast — 85%, hard but controlled, working on form
Hard — 95%, all-out drive, keeping form
100% — everything, with form – POV in the video below
Another 100% sprint (for intermediates)
Last 100% sprint (for advanced fitness folks)

Walking back down the incline is your rest. Take your time: 1.5 to 2 minutes of breathing, trying to reduce your heart rate. Your last sprint should have you at 85-95% max heart rate — I hit 160, which is my calculated max (220-age).

Total exertion time: about 3 minutes. Total time with rests: about 14 minutes.

How to scale it:

Beginner: 3 x 10-sec hill walks / progressively faster jogs, 2-3 min rests in between
Intermediate: 5 x 15-sec, build as I did, 2 min rests
Advanced / lean-focused: 6–7 x 15-sec, shorten rests to 60-90 sec

Safety note: sprint all-out only if you’re cleared by a medical professional to do vigorous exercise, warmed up, and on a clear, non-slippery surface.

Bottom line

If you’re truly sleep-deprived and have 60-90 minutes to nap in a dark room, take the nap. The science supports it.

If it’s the afternoon, you have 11-14 minutes, and you want energy now, sleep great tonight, and get leaner and stronger — skip the nap and sprint the hill.

I’m 60 years young. If I can do this, so can you!