Evidence-Based Training Content That Actually Makes Sense
Fitness Inbox breaks down training methodology, exercise technique, and conditioning protocols into practical information you can use.
We cover strength training, programming strategies, and exercise science applications without the fitness industry BS.
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How to Get Into the Marathon Majors: When Each Entry Window Opens
You decide in October that next year is your marathon major year. By then, half of them have already closed. The marathon majors take applications 7 to 12 months before race day. London’s ballot for April 2027 closed in May 2026. Tokyo’s lottery for March 2027 closed in August. If…
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Running Cadence: Why 180 Steps a Minute Probably Isn’t Your Number
At some point in your first year of running, someone told you 180. A coach, a watch review, a guy at run club. Take 180 steps a minute and you’ll…
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The Exercise Ick: Which Exercises to Swap and Which to Keep
There’s one exercise in your program you negotiate with. You set up slower for it. You count down the reps. Some weeks it’s the reason you skip the whole session….
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Fitness Benchmarks by Decade: 4 Tests That Show How You’re Aging
Two people can both be 52 and be training in different decades. One can sit on the floor and stand back up with no hands, hold one leg with their…
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Beginner Running Pace: How Fast Should You Run?
You finish a run, check your watch, and it says 13:40 a mile. Then you open the app and everyone you follow is running 9s. So you speed up next…
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Is Treadmill Running Easier Than Running Outside?
The belt holds your pace for you, there’s no wind, and nothing is uphill. By that logic the treadmill should be the easy option. Then you set it to the…
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5K Training Plan: 8 Weeks From 30 Minutes of Running to Race Day
You can run 30 minutes without stopping. A 5K is 3.1 miles, which for most new runners is another 5 to 15 minutes of running. You’re close enough that finishing…
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HYROX Doubles Isn’t the Easy Way Out. Here’s How to Train for It.
On paper, HYROX Doubles looks like the soft option. Two people, one race, split the work, finish fresh. Half the effort, right? Anyone who’s actually raced it will laugh at…
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How to Start Running: The 8-Week Walk to Run Plan
The usual first attempt goes like this. Lace up, head out, run as far as you can, gasp, walk home, decide running isn’t for you. Fitness wasn’t what stopped you….
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Walking Lunges vs Hip Thrusts: Which Builds Bigger Glutes?
The hip thrust has been the internet’s answer to “best glute exercise” for a decade, and it earned the title on one kind of evidence. Put electrodes on the glutes…
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The 30-Day Less Sugar Challenge: Cut It Without Missing It
Ask most people if they eat too much sugar and they’ll say no. They skip dessert. They don’t have a sweet tooth. Then look at where added sugar actually comes…
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What Happens to Your Body After a Marathon (And When to Run Hard Again)
Around day 4 after a marathon, the stairs stop being a problem. You can walk like a normal person again, and the itch to get back out there shows up…
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RPE vs RIR: How Hard Should You Actually Train?
RPE vs RIR sounds like alphabet soup until you realize they answer the one question every training session asks: how hard should this be? Most people answer it by feel….
