JointEffort

spine · knees · shoulders · rated on every exercise

Built for bodies
with mileage.

JointEffort is a workout builder where every exercise is rated for how much it asks of your back, knees, and shoulders. Tell it what to go easy on. Train hard with what's left.

One-time price. No ads. No subscription. Ever.

how the ratings work

Every exercise, rated 1 to 5, joint by joint.

The ratings are comparative. They rank movements against each other inside the library, the way "lower spinal load than a standard burpee" compares two exercises. They are educational, never medical advice, and never a promise that a movement is right for you.

three steps, every workout

Flag it. Filter it. Swap it.

Go easy on…
lower back right knee shoulders wrists hips ankles
2 flags active
1 · Say what to go easy onPick a joint, or stack several. Your flags follow you into every workout you build.
Libraryback + knee
Glute bridgespine 1/5
Bird dogspine 1/5
Wall sitknee 2/5
Sled pushknee 2/5
Hip hinge rowspine 2/5
+12 more low-spine options in the full library
2 · See what that leavesThe library re-sorts around your flags. Every exercise shows its ratings up front, even the ones you haven't unlocked.
Swap
Burpeespine 4/5
↓
Squat thrust, no dropspine 2/5

lower spinal load than a standard burpee

Bear crawlspine 2/5

easier on the spine, asks more of the wrists

tap to swap it in
3 · Swap what doesn't fitOne tap trades an exercise for one that targets the same muscles with less load where you flagged it, and tells you why.

We will never tell you an exercise is safe.

No app can promise that. What an app can do is measure movements against each other and show its reasoning, so you can decide with better information. That is the whole product: honest comparisons, your call. If a doctor or physical therapist has given you guidance, follow theirs, not ours.

pricing

Free to train. One small unlock for everything.

Free

$0

  • Interval workout builder and timer
  • Unlimited saved workouts, no caps, ever
  • A curated starter library, every exercise rated
  • Filter by one joint at a time
  • Swap suggestions from the starter library

Everything

$7.99 once

  • The full exercise library
  • Stack filters: easy on your back AND your knee
  • The full swap engine, ranked by your flags
  • Flare-Up Mode for rough weeks
  • Profiles for your partner or a parent
  • Training plans that respect your flags
  • Every feature we ever add. Strength and cardio builders are next.

No subscription. No ads. Yours forever.