Personalised Fitness Studio
Six directions for the studio's mark. Each is shown on the two backgrounds from the GymMobile app theme, hero black and scaffold off-white, then tested at app-icon size.
Each symbol on hero black at home-screen size (88 px) and favicon size (32 px). Concepts 03 and 05 use a reduced version here, because their full lettering would be unreadable. At 32 px, 01, 04 and 05 stay the clearest.
Any concept can take any of these. Each accent has one value for dark backgrounds and one for light backgrounds, chosen so it keeps at least 3:1 contrast on both.
Used in 01 and 04. Fresh and competitive, like your first two references.
Used in 02. The red from the GymMobile theme. It passes on both backgrounds, so one value is enough.
Used in 03 and 05. Hot and loud. Suits a strength-focused studio.
Used in 06. Quieter and more premium, like your fifth reference.