1. Let people see in
Window graphics covering every pane hide the best ad you have: people working out. Keep the glass clear at eye level, or limit graphics to the top and bottom.
2. Light the floor so it reads from outside
At night a lit gym is a lightbox. A floor lit brightly and evenly near the windows looks busy and alive. A dim floor behind glass looks closed, even when it isn't.
3. Give the building a beacon
A clean line of light on the fascia or roofline in your brand color says open from far down the road. See storefront lighting.
4. Make the walk from the car feel safe
The first visit happens in the parking lot. Bright, even light from the car to the door, and a lit entry. See safety lighting.
5. Make the front desk the brightest spot inside
New people look for a person. Light the desk so staff are easy to see from the door.
6. Keep the entrance clean and clear
Dead plants, taped-up flyers and a cluttered vestibule tell people what the inside looks like. Clear it.
7. Post your hours where drivers can read them
Especially for a 24-hour gym: hours on the door and the sign, readable from the lot.
8. Use warm light where people wait and change
Bright, cool light on the floor; warmer, softer light at the desk, the lounge and locker rooms, so the gym feels like a place to stay. See interior lighting.
9. Give members something to post
A neon line or lit logo wall. Every member photo is reach you didn't pay for. See photo wall ideas.
10. Fix the dead lights
A burned-out tube or a flickering sign letter says nobody's paying attention. They're the cheapest fixes there are.
When lighting won't fix it
Dirty equipment, a crowded floor, rude staff or confusing pricing will cost you members no matter how good the light is. Light makes a good gym easier to notice. It won't make a bad one good.
What we'd do at your gym
I'd walk it at dusk, see it from the road and the parking lot, and send a rendering with the storefront line, the entry, the floor scenes and a wall to post, with one price per piece. Most gyms start with the storefront and the photo wall.