How can I help?

Ferron suggests programs that match the fitness level in your profile, and they're grouped from beginner to advanced. If you're new to kettlebells, start with Kettlebell Basics. When you finish a program, Ferron shows you which one comes next. You can change your level at any time in your profile: tap your picture at the top of Home.

Set the bell you usually train with as your Working Kettlebell in your profile, where you also choose kilograms or pounds. A good bell is one you can press overhead 6 to 8 times with good form. At the end of a workout, Ferron asks which bell you used for each exercise and remembers it for next time.

Most programs need only one kettlebell. Double bell programs need two bells of the same weight, a few use a jump rope, and the Upper Body and Advanced Bell Skills programs need a pull-up bar. Each program says what you need before you start.

Yes. Build a workout from the exercise library and save it, or put several workouts together into your own program.

Settings › User Guide explains every workout and timer type, and how everything else in Ferron works, in plain words.

Open Insights on the Activity tab. It compares each workout with earlier sessions of the same program day, and shows your heart rate zones, your weekly kettlebell volume, your running pace and skipping rhythm, and your resting heart rate, HRV and cardio fitness from Apple Health. The heart rate zones need your date of birth in the Health app: they're worked out from your age and your resting heart rate, the same way Apple Fitness does it.

Finish every workout of a program. Each finished program earns an iron medal, and the dots under the kettlebell show its level. Your medals and your progress toward the next one are on your Profile, and the Trophy Case lets you relive each one.

Make sure Settings › Background Timer is on. Ferron then keeps timing and playing its beeps and bells with the screen locked, and shows the timer on your Lock Screen. Screen On keeps the display awake during a session instead. You can turn the sounds on or off and set how loud they are over your music in Settings › Sound & Haptics.

Ferron needs location access while you use it. Check iPhone Settings › Privacy & Security › Location Services › Ferron and choose While Using the App with Precise Location on. You can lock your phone during the run: tracking carries on, and iOS shows a blue location indicator while it does.

Ferron works with Bluetooth treadmills that support the Fitness Machine standard (FTMS), which most treadmills made in the last few years do. Turn the treadmill on, start an indoor run, choose Treadmill and pick it from the list. The treadmill then measures your speed, incline and distance, and its Start and Stop buttons run the session.

Choose Free Run when you start an indoor run. Your Apple Watch estimates the distance, or enter the belt speed on screen during the run and Ferron works it out from that. At the end, if the treadmill shows a different distance, type it in before you tap Well Done. Your Apple Watch also gets better at measuring indoor runs after a few outdoor walks or runs.

With your Apple Watch on, Ferron counts your jumps from the watch's motion sensors as you skip. Without a watch, or if the count is off, you can type in the right number on the summary screen before you save.

Ferron picks by itself when a workout starts. If Ferron is on your Apple Watch, the watch tracks it. If you're wearing a paired heart rate strap and have no watch, the strap does. With both on, Ferron asks which one to use, and you can turn on Remember my choice so it doesn't ask again. With neither, your iPhone tracks the workout and estimates the calories. You can change all of this in Settings › HR Monitor & Tracking.

A bell can knock a watch around your wrist, so you can train with a Bluetooth chest strap instead. Put the strap on before you start, and pick Heart Rate Monitor if Ferron asks. Ferron then leaves your watch alone, shows your heart rate live, works out your calories from it, and your iPhone saves the workout to Apple Health when you finish, just as the watch would.

Go to Settings › HR Monitor & Tracking, put the strap on and tap Find Monitor. Any Bluetooth chest strap or armband that uses the standard heart rate profile works, such as Polar or Wahoo. After that, Ferron connects to it by itself whenever you put it on with the app open; wetting the sensors a little wakes it up faster. You can see the strap's battery level while it's connected, and swipe a strap to the left to remove it. If you also wear an Apple Watch, the strap stays on as a backup for the watch's heart rate.

Install Ferron on your watch from the Watch app on your iPhone. Then start a workout, run or skipping session on your iPhone as usual, and Ferron opens on your watch by itself, showing your heart rate, calories and the current exercise.

Keep the watch on your wrist and unlocked, with your iPhone nearby and Bluetooth on. Ferron tries again by itself if the watch doesn't respond at first. Your iPhone keeps recording the workout either way, so your session is never lost, and if the watch saved it to Health, Ferron picks up its heart rate and calories afterwards.

Turn it on in Settings › Apple Health. If you said no earlier, open the Health app, tap your profile picture, then Apps › Ferron, and turn the switches on.

Workouts tracked with your Apple Watch are saved by the watch, and workouts tracked with a heart rate strap are saved by your iPhone when they finish. If you wore the watch, give it a moment to sync with your iPhone. Then open the workout in Ferron and tap the heart icon marked Add to Health: if your watch saved it, Ferron links it and fills in your heart rate and calories; if not, your iPhone adds it to Health. Timer sessions aren't saved to Health.

With a strap, Ferron works out your calories from your heart rate, your age, weight and sex, and your cardio fitness from Apple Health. An Apple Watch also uses its motion sensors, so the two are two different estimates and rarely match to the calorie. In kettlebell work they're usually close. A chest strap picks up quick rises in heart rate sooner than a watch on a moving wrist, which can make Ferron's number a little higher on hard sessions.

Ferron is a subscription, monthly or yearly, and both start with a free week if you haven't had a Ferron trial before. It unlocks everything: all programs and workouts, timers, runs and skipping, Apple Watch and Apple Health, Bluetooth treadmills and heart rate straps, and iCloud backup. Without a subscription you can still open the app, look at your history and use Settings.

Go to Settings › Membership › Manage Subscription in Ferron, or open the iPhone Settings app and tap your name › Subscriptions. Cancel at least a day before the trial or the current period ends, and you won't be charged again. You keep access until the end of the time you've paid for.

Tap Restore Purchases in Settings › Membership while you're signed in with the Apple Account you subscribed with.

No. Everything you train with is in the app, so you can work out with no connection at all. Ferron only goes online for Apple's services: to check your subscription, to show maps of your runs and, if you use it, to back up to iCloud.

Apple handles all payments, so refunds go through Apple. You can ask for one at reportaproblem.apple.com.

Open your profile, then Backup. There you can export a backup file and import it on another device. Subscribers can also back up to iCloud, automatically after every workout or whenever they like, and tap Restore from iCloud on a new iPhone. Restoring adds the backup to what's already on the device and never deletes anything.

To protect your health data, Ferron leaves heart rate, calories and body weight out of the iCloud backup. After a restore, Ferron reads heart rate and calories back from Apple Health for workouts your watch recorded. A backup file you export yourself keeps everything.

Clear All History in your profile deletes every workout, run, skipping and timer session, removes the matching workouts from Apple Health, and clears them from your iCloud backup. Delete iCloud Backup in the Backup screen removes the backup itself. Deleting the app removes everything else from your device.