SFY

Your strongest decade hasn't happened yet.

Strength, balance and power focused programs, written by a trainer with twenty years of practice, rebuilt every morning around the day you're actually having.

Take the Youthspan Snapshot →

Free, no account. About ten minutes.

20 years, 1,000+ one-on-one clients coached — now written into one app.

Five tests. One number. Retested at Week 22.

Balance, grip, leg power, getting up off the floor, and how fast you react. Life tests, not gym tests — they are the things that decide how the next twenty years actually go.

Your youthspan
74
Solid base
A sample. Yours comes from your own five numbers, read against people your age.
Excellent
  • Single-leg balanceBalance · fall risk45–60s
  • Floor sit-to-standStrength + flexibility + coordination8–10
  • Dead hangGrip endurance · shoulder health90–120s
  • 5× chair sit-to-standLower-body power · fall riskunder 6s
  • Reaction timeReaction time · neural speedunder 250ms

Week 22 you take the same five tests again. That number moving is the whole point.

Most programs survive right up until life gets in the way — a bad night's sleep, a sore shoulder, 25 minutes instead of 50. This one changes the session instead of asking you to skip it, which is the only reason anyone is still doing it in Week 22.

A look inside

Three screens you'll actually use. Swipe.

Today
Pull Block · Week 6
Block
PRs
Nourish
Youthspan
NEXT UP
Deadlift + Pull-Up · Day 2
Week 6 of 22 · about 45 min
Start
SPOTTER
Grip gave out before your back did last week — straps on the last two sets today.
Today — one screen that answers “what do I do now?”
Workout
Deadlift + Pull-Up
Pull Block · Week 6 · Day 2
DeadliftPR
185 × 5205 × 5225 × 5
Pull-Up
3 sets · as many as you own
Single-Arm Row
3 × 10 each side
Adjust — hurts · short on time · no gear
Your session, already built — log it set by set
Nutrition
3 of 5 today9-day
Notice what you ate
One big salad
Beans or tofu
Plants every meal
Snap a meal
THIS WEEK ON YOUR PLATE
Beans showed up almost every day — that's the anchor working. Greens went missing after Tuesday.
The Daily Five. No macros, no weighing
Derek Tresize holding bunches of carrots

Plant-powered. No macros, no weighing.

Eating for muscle on plants is a different job than eating for muscle on meat, and it's the part most programs skip. This one doesn't.

Nutrition here is the Daily Five:

  • Notice what you ate
  • One big salad
  • A serving of beans, lentils or tofu
  • A serving of plants at every meal
  • One more that flexes to what you're training for

Check them off. That's the whole system.

No gram targets, no weighing your dinner, no logging every bite. Snap a photo of a meal if you want it coached.

It adapts the same way the training does, as your week and your training load change.

Stronger

Focus on key lifts like squats and presses, four weeks at a time. Build up your strength and chase records, whether that's one heavy rep or a set of fifteen. The app remembers your lifts and tells you when you beat them.

Faster

Something fast and explosive like throws or jumps comes first in every session, while you're fresh. It's the quality that goes first with age, and it's what keeps you light on your feet and catches you when you trip on a curb.

Younger

Balance, coordination, and exercises designed to build resilience and protect your joints, so you can keep training for years to come. We prioritize what declines fastest with age, because that's what keeps you feeling and moving younger.

A “Spotter” coach gives you cues in-session — Derek wrote every workout; the app just delivers the right day and adjusts it to your sleep, soreness and time. How much is software, how much is a person

Who this is for

Adults roughly 45–65 who want to be strong, steady and capable for decades — and, yes, to look like someone who trains. Both are good reasons.

Plant-based or plant-curious. Training around an old injury is expected, not a problem.

Not for you if you want a shredded-in-six-weeks physique plan, a macro calculator, or a program you never have to lift four days a week for.

It's also not rehab — if something is injured, see someone who can put hands on it first.

Who's behind this

Derek Tresize, founder and coach

Derek Tresize

Plant-based trainer, 20 years · B.S. Biology · ACE-CPT · WNBF Pro Bodybuilder

I've been coaching for twenty years, all of it plant-based. For most of that time the people who wanted real programming had two options: pay a trainer $300–600 a month, or download an app that hands you a template and a chat box.

So I wrote my whole system down. It's 22 weeks, and it uses a rotating emphasis periodization — it rotates what you're trying to progress each training block, but the targets are the capacities we lose fastest as we age: strength, muscle mass, muscle power, cardiovascular endurance, and balance. Every workout in here is one I wrote, and every demo video is me.

What the app does is hand you the right day at the right time, and change it when you tell it you slept badly, your shoulder is cranky, or you've only got half an hour. That's it.

Check any of this yourself

  • ACE-CPT #T121339Personal Trainer Certification, current through Feb 2027. Checkable in ACE's public verification tool
  • USREPSListed in the United States Registry of Exercise Professionals
  • WNBF ProNatural pro card, World Natural Bodybuilding Federation
  • Vegan Muscle & FitnessDerek Tresize's work outside this app
  • Root Force PTDerek Tresize's work outside this app

No press logos, no five-star badge. The program is in early access and has nothing to show there yet — these are the credentials behind it, and the registries that hold them.

Start where the program starts: find out what your balance, grip and power say about how old your body is performing.

Free, no account. About ten minutes.

Or start the program

Still deciding? Read the questions people ask first.

What it costs

3 days free, then $29/mo or $249/yr. Cancel during the trial and you won't be charged.

EARLY ACCESSThe 22-week program, tracking, nutrition and youthspan testing all work today. You're early, so you help shape what ships next. What that means for you