Happy New Year! Physical AI has been getting famous these days. Therefore, I also join this trend by doing my physical AI—specifically, my physical 💪 (it’s a joke). To check out what Physical AI is, check out this. AI can build workout programs for me, but it can’t build muscles yet!

Just in time, Planet Fitness opened in Davis recently, so it’s a perfect time to see how AI could assist in its own version of physical AI by designing a personalized workout program.

Designing a Workout for a Beginner with LLMs

I started by asking Google Gemini for a beginner-friendly routine:

User: I’m a beginner in fitness training. Please create a one-hour full-body workout program for Planet Fitness.

Gemini: Welcome to the fitness world! Planet Fitness is a fantastic place for beginners because it’s designed to be “judgment-free” and has plenty of user-friendly equipment. Since you’re just starting, this 60-minute Full-Body Routine focuses on building a foundation of strength and stamina using mostly machines…

Phase 1: Warm-up (10 Minutes)

Goal: Raise your heart rate and prepare your joints.

Treadmill or Elliptical: 10 minutes at a brisk walking pace.

Phase 2: Strength Training (35 Minutes)

Goal: Target all major muscle groups. Aim for 2 sets of 12 repetitions for each exercise with 60s rest.

Muscle Group	Exercise	Why?
Legs	Leg Press Machine	Safely works glutes, quads, and hamstrings.
Back	Lat Pulldown	Builds back strength and improves posture.
Chest	Chest Press Machine	A safer alternative to the bench press.
Shoulders	Shoulder Press Machine	Strengthens the deltoids.
Core	Abdominal Crunch Machine	Stabilizes the spine and builds core strength.
Lower Body	Seated Leg Curl	Specifically targets the hamstrings.

Pro Tip: Look for the yellow QR codes on the machines. Scan them with your phone for a quick instructional video if you’re unsure about the setup.

Phase 3: Cardio Finisher (10 Minutes)

Stationary Bike or StairClimber: 10 minutes at moderate intensity.

Phase 4: Cool Down & Stretching (5 Minutes)

Hamstring Stretch: Reach for your toes.
Chest Stretch: Use a wall or pole to rotate away.
Overhead Triceps Stretch: Reach down your back and gently push your elbow.

Beginner Tips for Success

Consistency > Intensity: 30 minutes 3 times a week is better than one 2-hour session.
Stay Hydrated: Use the touchless filling stations.
30-Minute Express Circuit: A great alternative for when you’re short on time.

The routine Gemini put together was surprisingly comprehensive. While I wasn’t entirely sure what machines were available there, specifying the “Planet Fitness” in the prompt allowed Gemini to tailor the program perfectly. I’ve been following it and am very satisfied with the results!

Building a Web App with LLMs

Google Gemini introduced a feature called Dynamic View. This allows users to generate fully functional, dynamic applications from simple, zero-shot prompts. I decided to test it using the same workout prompt.

Dynamic View Screenshot

I was impressed that it even went as far as including an image of the gym. You can explore the generated app via the link below: Explore the Gemini Dynamic View App

Since I couldn’t find the source code from the dynamic view, I also tried a similar task using Gemini’s Canvas feature. With Canvas, I first drafted the exercise program and then asked Gemini to transform it into a dedicated, interactive web page. The result looks like this:

Outro

The fast advancement of LLMs and AI continues to amaze me. Reflecting on my own experience, I spent an entire quarter learning Node.js to build a data visualization like this project: (Project Link), yet this AI-generated demo looks significantly more polished and took only seconds to create.

There is often discussion about AI replacing traditional jobs. In my view, AI will not take your job; rather, the individuals who are good at these AI tools will get new opportunities. As a researcher in 2026, I see AI as a powerful tool, but ultimately, finding things that need to be done, making objectives, and acutal execution are in the hands of the people using it, just like you still have to go to the gym yourself to build muscle.