If you only track three things for your health, make them active calories, steps, and sleep. They’re simple, your phone or watch already measures them, and together they cover the two things that matter most for staying fit and independent for decades: how much you move and how well you recover.
These are the three numbers the Don’t Die app turns into a single daily score, and they’re the three I check every day. Hit all three, and your day is scored Perfect. Here’s why each one earns its place.
1. Active Calories: How Hard You Moved
Your body burns calories all day just to keep you alive. Active calories are the extra ones you burn by moving: walking, working out, climbing stairs, carrying groceries, playing with the dog.
That makes active calories a good measure of effort. Steps tell you how far you went; active calories tell you how hard you worked. A brisk uphill walk, a strength workout, or a bike ride all raise this number, even when your step count doesn’t change much.
My daily target is 350 active calories. Most days I get there with a walk with Maggie and a BODi workout or a run. You don’t need a big number to start. Pick a target you can reach most days, and nudge it up over time.
One note: your watch may also show “total calories,” which includes everything your body burns at rest. That number is much bigger. For daily movement, active calories are the one to watch.
2. Steps: How Much You Moved
Steps are the simplest measure of all-day movement, and the research behind them is strong. A 2022 analysis of 15 studies with more than 47,000 adults found that people who took more daily steps had a much lower risk of dying during the study period. The top three activity groups had a 40 to 53% lower risk than the least active group.
Even better news for anyone over 60: the benefit leveled off at about 6,000 to 8,000 steps a day. For adults under 60, it leveled off at about 8,000 to 10,000. You don’t need to chase huge numbers to get most of the benefit.
My daily target in the Don’t Die app is 3,500 steps, a floor I never want to fall below. On most days, walks and runs carry me well past it. Last week my Polar watch counted 118,285 steps, about 16,900 a day.
3. Hours Slept: How Well You Recovered
Sleep is where your body repairs muscle, restores energy, and gets ready for tomorrow. Skip it, and every workout costs more and gives back less.
The National Sleep Foundation recommends 7 to 9 hours a night for adults 18 to 64, and 7 to 8 hours for adults 65 and older. My target is 7 hours, and last week my Polar watch recorded an average of 7 hours 39 minutes a night.
Why These Three Work Together
Each number covers something the others miss:
- Active calories show how hard you moved.
- Steps show how much you moved all day.
- Sleep shows whether you recovered enough to do it again tomorrow.
Hitting one or two isn’t enough. A hard workout followed by a short night isn’t a good day. Neither is a long night’s sleep after sitting all day. When all three line up, you’ve had a day that builds health instead of borrowing against it. And when you string those days together, you’re building what I call your functional fitness: the strength, endurance, and energy to keep doing what you love for decades.
How to Start Tracking Your Three Numbers
- Use what you already have. Most phones count steps, and most fitness watches track active calories and sleep.
- Set targets you can hit most days. Start modest, then raise them as they get easy.
- Look at the week, not just the day. One short night or a rest day isn’t a problem. The weekly pattern is what counts.
- Make it social. The free Don’t Die app scores all three automatically and lets you share your streaks.
Join Me in The 104.8 Club
I started The 104.8 Club on the free Don’t Die app for anyone who wants to live all four marathons of life strong. Members post their daily scores and keep each other showing up. Come join us, and let’s see how many Perfect days we can string together.
Don’t Die App Score for October 14th, 2026
Sources: Paluch AE, et al. “Daily steps and all-cause mortality: a meta-analysis of 15 international cohorts.” The Lancet Public Health, 2022. National Sleep Foundation, sleep duration recommendations. This post is general information, not medical advice; check with your doctor before starting a new exercise program.
Rich Dafter is the founder of HowToBeFit.com, a lifelong runner, former ACE Certified Personal Trainer, BODi Coach since 2007, and Polar athlete and brand ambassador for 40 years. At 75, he continues to run, hike, strength train, and share practical strategies for fitness, strength, nutrition, longevity, and more. Learn more about Rich Dafter on the About page.
