Best Fitness Apps for Strength Training in 2025

If you’re aiming to build muscle and boost your strength, or to just generally enhance your fitness, a good fitness app can be a game-changer in achieving your goals. This guide explores the top fitness apps in 2025 that have a special focus towards strength training and have earned the respect of professional trainers. Let’s dive straight in.

Fitness Apps for Strength Training

We’ve selected five apps to profile based on their widespread use and respect in the fitness industry. Each app’s profile includes a breakdown of its features, ease of use and it’s cost.

1. Nike Training Club: The Free, Widely Used Option

Description and Features

Nike’s free training app reduces the barrier to entry for designing an effective weight-based workout for yourself at home or in a commercial gym. The entire workout library is free to use. But don’t be fooled by that price tag: the level of value NTC provides makes it something of a unicorn in the arena of free apps. All of the instructors are certified and most are specialists so it’s well worth your time, especially if you’re new to strength training and looking for somewhere to start.

You can filter workouts by the type of equipment you have available. There’s a number of bodyweight-only workouts If you’re new to strength training or have limited equipment but you’ll need a basic set of dumbbells or kettlebells for the majority of workouts. The NTC app has on-demand and live classes as well as periodic programming for a variety of goals and workout types. You can filter workouts by type, muscle group, etc

Downsides

NTC is not going to hold you accountable, though you can join programs or challenges to help with that. There also isn’t a way to filter by your experience level. It can sometimes be hard to see on-screen metrics like reps and time.

Link: Nike Training Club

2. JuggernautAI – Advanced Lifter’s App

Description and Features

Created by accomplished powerlifter and coach Chad Wesley Smith, this app uses AI to create a personalized program for you and your strength goals. Based on an assessment of your weight, training load, training schedule, personal records and fitness goals, the app will create a training program. This will be adjusted as you go, depending on your current level of fatigue and soreness before to each workout.

While the focus is on powerlifting and powerbuilding, many other athletes use JuggernautAI to build strength for improving their performance in their own events, like triathlon.

Downsides

The dashboard can be overwhelming initially as there’s a lot of features to take in. But once you’re familiar with the interface, it makes sense and is easy to use. An app is not the same as working with a real coach and this app is specifically for strength training and nothing else (no cardio workouts).

Link: JuggernauutAI

3. Centr: The Award-Winning, Holistic Fitness App

Description and Features

Created by actor Chris Hemsworth (best known as Thor) and his personal trainer, Luke Zocchi, CENTR is a very well-rounded personal training app. There’s a wide selection of strength training classes, yoga exercises, daily meditations, plus inspiring meal plans and recipes created by professional chefs.

The app gives you the ability to select your workouts based on your available equipment from bodyweight, home gym, to commercial gym. You can pick beginner, intermediate, or advanced programs that get progressively harder. You’ll also get a logbook to track your progress.

Downsides

There’s not much in terms of accountability or community engagement like leaderboards, so you’re not going to get much external motivation from the app. Not really suited to total beginners. No interactive coaching.

Link: Centr

4. Shred App: AI-Driven Strength Training

Description and Features

The SHRED app can use your smartphone’s camera to track and rate your performance using AI. Your program will be customized based on your performance. The app creates workouts based on what type of equipment you have. Options include dumbbells, kettlebells, resistance bands or even bodyweight workouts if you don’t yet have access to equipment.

While strength training is the focus of the app, there are many yoga and mobility classes also available. The instructors will explain each movement in a program as they’re going through it and provide alternatives for people who are not advanced enough for some movements. There are Military, first responder, teacher and student discounts.

Downsides

Some users have complained that the app can be a little glitchy.

Link: SHRED

5. Ladder: Personal Training Through an App

Description and Features

Ladder connects users with certified personal trainers offering 14 strength training programs from coaches with different training styles that include strength x yoga, kettlebells, bodybuilding and HIIT workouts with the goal of getting stronger over the course of six-week cycles.

Following the video feed as your coach takes you through a pre-programmed workout – complete with coaching feedback – provides a near foolproof way to achieve progressive overload. It’s great if you need a fitness app that provides accountability and expert guidance from home.

Downsides

Not recommended for true beginners. Only available for iOS.

Link: Ladder

Conclusion

In the end, the choice of app you use boils down to your personal goals and budget. Don’t let a tight budget stop you from strength training when Nike Training Club offers incredible value, for free. If you need guidance and motivation, consider Ladder’s personal training benefits. AI-driven feedback from Shred is highly innovative while Juggernaut will take your strength gains to the max. Centr offers a comprehensive and more balanced experience. Consistency is key to your success, so choose an app you’ll enjoy using regularly.