K&L Fit puts the week's workouts on your client's phone. They log every weight, attendance tracks itself, and you both chat in the same app, voice messages included.
Free for clients. Trainers start free with 1 client.
During the workout, your client logs the weight and reps for every set and checks off what's done. The timer runs on its own.
Next time, the weights from the last session are already filled in, and the trainer sees the progress on a chart.
The dashboard shows each client's days trained, days missed and days still to come. A missed day is counted automatically when a workout day goes by without a workout.
The monthly leaderboard highlights who's most consistent, by attendance, points or weight.
Build each day from a library of more than a hundred exercises, each with a short video showing proper form.
Save the week as a template and assign it to several clients at once. Changed the workout? Your client's history stays intact.
Trainer and client chat by text or voice messages up to 2 minutes long, separate from WhatsApp.
Even with the app closed, a new message shows up as a notification on the phone.
When you finish a workout, the app asks if you want to post it. The post comes with the summary built in (duration, volume and the weight for each exercise), and you can add up to 4 photos.
Friends like and comment. Each post is for your friends or just for you. Invite your workout buddies with a link on WhatsApp, by email or by name.
In Progress, save body photos with the date and pose, and swipe from one to the next, just like your phone's gallery.
These photos never go to the Timeline, your friends or your trainer. Delete one or all of them whenever you want.
🔒 Only you can see these photos.
October 2026
Signing up as a trainer is free and takes a minute.
By email. The invite shows up in the app as soon as they sign in.
From scratch, from one of your templates or with help from AI.
Attendance, weights, measurements and chat, all in one place.
Clients never pay. Trainers start free with 1 client and switch to VIP whenever they're ready to coach more people.
Free
Forever. No card needed.
R$ 0
Get started, no strings attached.
R$ 23,99/mo
R$ 287,90 per year
For now, VIP is available only with cards issued in Brazil. Prices are in Brazilian reais (R$).
On iPhone: open klfit.app in Safari, tap Share and then Add to Home Screen.
On Android: open it in Chrome and tap Install app.
K&L Fit opens full screen with its own icon. Turn on notifications in your Profile to know when a message comes in.
No. Clients and regular users use K&L Fit for free, no card needed. Only trainers who want to coach more than 1 client at a time subscribe to VIP.
No. Open klfit.app on your phone and add it to your Home Screen: K&L Fit opens full screen with its own icon and lets you know when a message comes in.
Yes. In My Workouts you plan your week, log your weights and track your progress, all for free.
Nothing is deleted. Clients are paused, the trainer picks 1 to keep on the Free plan, and everyone comes back when they return to VIP.
Your data is handled under Brazil's data protection law (LGPD): you can export or delete your account right in the app, and no one on our team reads the chat between trainer and client. The team panel requires two-step verification and logs every access. The details are on the Security and Privacy Policy pages.
Only your friends on K&L Fit, and only the posts you set to "Friends". A "Only me" post is visible to you alone. Your body photos in Progress are never shown to anyone: not your friends, not your trainer.
In Friends, copy your invite link and send it on WhatsApp: whoever opens it becomes your friend. You can also invite by email or search by name. If you'd rather stay private, turn off "Show in search" and only people with your link can find you.
In Find a trainer, filter by city, specialty and in-person or online sessions. Every trainer lists their professional registration. Chat with them in the app, or on WhatsApp when the trainer shares their number. Rates and hiring are arranged directly with them.
Yes. When you accept another trainer's invite, the app asks you to confirm and ends the previous connection. Your workout history stays with you.