Modifiers matching athletics:

• organized,
• light,
• recreational,
• heavy,
• favourite,
• individual,
• extracurricular,
• intramural,
• overhead,
• intercollegiate,
• interscholastic,
• indoor,
• seasonal,
• vigorous,
• professional,
• competitive,
• strenuous,
• aggressive,

Simple categories matching indoor:

• condition,
• activity,
• celebration,
• sport,
• institution,
• play,
• partition,
• facility,
• place,
• creature,
• area,
• environment,
• game,
• meeting,
• fitting,
• use,
• machine,
• allergen,
• exhibit,
• toy,
• control,
• action,
• event,
• renovation,
• location,
• lighting,
• exposure,
• surface,
• task,
• building,
• diversion,
• food,
• space,
• housing,
• loudspeaker,
• usage,
• firework,
• problem,
• establishment,
• shot,
• antigen,
• flower,
• devices,
• container,
• party,
• theatre,
• item,
• houseplant,
• installation,
• plant,
• application,
• equipment,
• photograph,
• treatment,
• coating,
• arena,
• passage,
• housework,
• function,
• pollutant,
• pet,
• furnishing,
• structure,
• unit,
• noise,
• fixture,
• scene,
• insect,
• product,
• device,
• climate,
• graphics,
• work,
• gas,
• air,
• light,
• fuel,
• dog,
• particulate,
• setting,
• animal,
• pest,
• stuff,
• substrate,
• pesticide,
• organism,
• room,
• performance,
• stadium,
• chemical,
• athletics,
• allergy,
• assembly,
• furniture,
• covering,
• set,
• recreation,
• lamp,
• venue,
• art,
• atmosphere,
• sound,
• floor,
• fun,
• wall,
• medium,
• ornament,
• tile,
• fountain,
• obstruction,
• component,
• course,
• antenna,
• enclosure,
• bird,
• site,
• appliance,
• project,
• contaminant,
• centre,
• particle,
• clientele,
• shelter,
• lodging,
• support,
• exercise,
• communication,
• quality,
• pool,
• substance,
• job,
• restaurant,
• drain,
• vehicle,
• attraction,
• source,
• material,
• entertainment,
• gathering,
• decoration,
• thing,
• object,
• display,