Solution
Based on the criteria provided in IFRS 15, the performance obligation of the health club is satisfied over time. Here's why:
Given that the performance obligation is satisfied over time, the entity should measure its progress towards complete satisfaction of the performance obligation.
In this particular case, a straight-line method would be appropriate to measure the progress, as the customer has the right to use the facilities throughout the period in an even manner, assuming there are no specific clauses in the contract that would significantly change the customer's rights or the entity's performance over the contract period.
Therefore, the health club should recognize CU100 each month as revenue, as the customer has an equal right to access the club’s facilities throughout each month. This represents a straight-line recognition of revenue over the duration of the contract.