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Fitness skill
Fitness is one of the skills in inZOI, available to Teenagers, Young Adults, Adults, Middle-Aged, and Senior Zois. As the skill increases, the Zoi's body becomes more toned and muscular -- the change is visual, especially noticeable if the Zoi started with a less-fit build. Higher fitness makes physically demanding activities easier and improves success rates on certain romance interactions.
The skill currently doesn't have documented level-by-level unlocks like some other skills. The developers may add gated content behind fitness levels in future updates.
How to improve fitness
Gym equipment
Workout machines are available at outdoor gyms and can be purchased through Build Mode for home use. Equipment includes treadmills, weight lifting machines, pull-up bars, and other fitness machines. The game sorts exercises into upper body, lower body, and cardio categories. Working out drains Hunger and Energy needs faster than usual, so keep an eye on those bars. Your Zoi will probably want a shower afterward.

Yoga
Buy a yoga mat from Build Mode and place it at home. Yoga starts with simple poses and meditation. As the Fitness skill grows, the Zoi unlocks more poses and can develop custom routines. Yoga is a gentler option that doesn't drain energy as aggressively as weight machines, making it good for Zois who need to build fitness without constantly eating.

Fitness books
Books with exercise-related titles (look for words like "Running" or "Physical") raise the Fitness skill passively. Find them at libraries, bookshelves, and on tablets. Reading isn't the fastest way to level, but it works when your Zoi doesn't have the energy for a full workout. Queuing up multiple fitness books and fast-forwarding is a common strategy.
Idol career
Working as an Idol in Dowon includes fitness-related tasks that level the skill while also earning Meow. If you're trying to build fitness and income at the same time, the Idol path handles both.

Outdoor gym locations
There are no indoor public gyms in inZOI during Early Access. The two outdoor gyms are:
Muscle Beach in Bliss Bay -- outdoor equipment near the coast
Harang River Park in Dowon -- equipment in the park area along the river
Some apartment buildings in Dowon also have fitness equipment in common areas. Players can always buy equipment through Build Mode and set up a home gym.
Energy drain
Exercise eats through energy and hunger fast. Plan meals before and after workouts. If your Zoi's needs drop too low during exercise, they'll stop and complain. The Fitness skill ties into surfing (which requires a baseline fitness level) and swimming endurance.
Fitness Master ambition
The Fitness Master ambition is one of the Health-category ambitions. It requires regular gym visits and fitness activities across its 3 progression levels. This ambition pairs with the Life of Adventure desired life.