If a workout routine matters to your trip, gym access near JKIA is worth confirming directly – it's not standard in every listing.
In-Building Gyms Are the Exception, Not the Rule
Most standalone apartments near the airport don't have an on-site gym; it's more common in larger serviced apartment complexes. If a listing advertises gym access, confirm it's actually within the compound and not a shared amenity requiring a separate membership.
Alternatives Worth Asking About
Some hosts can point you to a nearby gym with day-pass access, which is often a more realistic option than expecting on-site equipment. A property with simply enough floor space for bodyweight training is a reasonable fallback for a short stay.