An athlete training
For Athletes

Train like an athlete, not just log like one.

Workouts, runs, challenges, and a feed - with a coach in the same app if you want one, or fully on your own if you don't.

Muscle activation map and per-exercise training load history
Muscle Activation Map

See what you actually trained.

A visual body map shows which muscles each workout hit - not just a list of sets and reps.

Learn more
GPS run tracker with route map and shoe selected
Run Tracking & Shoe Mileage

Lift and run, in the same app.

GPS pace, laps, and elevation for every run - plus mileage tracked per pair of shoes, so you know when it's time to retire them. Live Activity on the lock screen, and a companion watch app.

Learn more
Challenge progress and details
Challenges & Rewards

Compete for something more than a streak.

Join challenges and earn shareable reward cards when you win - post them straight to the feed.

Learn more
Social feed and friend stat comparison
Social Feed & Compare Stats

Not just a private log.

A feed of workouts, runs, and achievements from people you follow - with comments, likes, and polls. Pick any friend and compare stats side-by-side.

Learn more
Body measurements tracked over time
Progress Tracking

See the trend, not just today.

Log weight and body measurements, and watch the trend over time - not just a single snapshot.

Learn more

Training on your own today?

Connect with a coach and join their community right in the same app - same log, same history, no new account.

See how coaching works

A workout logger vs. Castra

A Workout Logger Castra
Sets, reps, and a history list That, plus muscle maps, run tracking, and shoe mileage
Solo, or bolted-on social features A real feed with polls and friend comparisons
A coach means a different app A coach is one tap away, same app, same history

Start free. Upgrade when you're ready.

Free covers workout & run tracking, 7 custom exercises, and 1 generated plan. Athlete Pro unlocks unlimited exercises, plans, and full analytics.

See full pricing
Athlete building a custom exercise

Log your first workout in under a minute.