One default price, exceptions on the person
Set the monthly membership once. Students, couples, the early-bird crowd: a custom fee on each of them, visible in the grid, no price list to maintain.
Classes as trainings
Morning HIIT, evening mobility, Saturday open gym: put them in the schedule, duplicate the week with a tap, keep the session plan in the note. Group classes get an attendance sheet, so you see which slots fill and which ones to drop.
Who dropped off
The due list shows who has not paid for the current month; the member's page shows when they last came. The two together are your retention list: message the members who stopped coming before they stop paying.
Personal training and extras
A block of personal sessions, a towel fee, a nutrition plan: other payments with a reason, kept next to the membership on the member's record.
Costs next to income
Rent, trainer pay, new plates: record expenses with a category and a month, and the season summary shows what the gym actually keeps. Export it when the accountant asks.