Instructor Substitute
Also called: sub instructor, instructor coverage, class sub
Coverage is a permanent operational reality. Instructors get sick, have family emergencies, get called away. The studio's job is to keep the class running and the member experience consistent, which means a tested roster of sub-eligible instructors and clear rules about who pays what.
Three pay-handling patterns dominate. Full sub pay: the sub gets the original instructor's rate for that class; the original instructor gets nothing. This is the cleanest, most common model. Studio absorbs: the studio pays both the sub and the original instructor (rare; only on pre-approved absences like maternity). Split: original instructor finds their own sub and they negotiate the pay between themselves; the studio just pays the line as if the original taught — risky from a labor-law angle in W-2 markets.
Software needs to handle this with a fee snapshot at the substitution moment. If the original instructor's rate was $50 and the sub's rate is $55, the session pays $55 to the sub — and that snapshot lives on the session record so future rate changes don't rewrite the cover.
Subs also affect attendance. A class taught by an unknown sub commonly drops 15–25% in same-day attendance once members see the schedule change. Push the schedule update early (24+ hours notice) and many of those members re-book; push it day-of and most just skip.