Simple categories matching strenuous:

• activity,
• works,
• sport,
• situation,
• training,
• event,
• sessions,
• game,
• exercise,
• thing,
• exertion,
• work,
• use,
• occupation,
• athletics,
• endeavor,
• job,
• workout,
• exercising,
• effort,

Members with property strenuous:

• swimming,
• prolonged_sport,
• office_work,
• impact_aerobics,
• football,
• exercise,
• basketball,
• golf,
• wrestling,
• polo,
• tennis,
• painting,
• lengthy_workout,
• field,
• volleyball,
• net_fishing,
• agricultural_labour,
• athletic_competition,
• hard_exercise,
• sexual_intercourse,
• weightlifting,
• bodybuilding,
• acting,
• soccer,
• playing_tennis,
• yoga,
• cricket,
• gymnastics,
• surveying,
• sewing,
• factory_work,
• aerobics,
• heavy_exercise,
• movement_class,
• marathon_training,
• horseshoes,
• sex,
• snooker,
• singing,
• pool,
• track,
• fire_fighting,
• body_building,
• exercising,
• pleasure,
• tournament_championship,
• competitive_athletics,
• game,
• gym_work,
• dancing,
• competitive_basketball,
• food_preparation,
• pushup_exercise,
• ballet_dancing,
• physical_intercourse,
• strenuous_sport,
• handball,
• physical_strain,
• badminton,
• administration,
• straining,
• resistance_training,
• lacrosse_practice,
• manufacturing,
• racquet_sport,
• baseball_pitching,
• extreme_weightlifting,
• volley_ball,
• football_workout,
• pelota_handball,
• dance,
• snow_skiing,
• loud_singing,
• lifting_chair,
• heavy_construction,
• hill_sessions,
• longer_run,
• lacrosse,
• bicycling,
• strength_exercise,
• rigorous_exercise,
• kitchen_job,
• adventure_challenge,
• foundry_work,
• boating,
• competitive_sport,
• farming,
• professional_dancing,
• stretching_exercise,
• football_practice,
• softball,
• long_period,
• acrobatics,
• dressage,
• diving,
• strength_training,
• rounders,
• heavy_weightlifting,
• chair,
• nursing,
• playing_soccer,
• doing_housework,
• racket_ball,
• construction_work,
• skating,
• publicity_event,
• flag_football,
• heat,
• baseball,
• planting,
• hockey,
• treadmill,
• playing_sport,
• aerobics_routine,
• bullfighting,
• grocery_shopping,
• racquet_ball,
• obstacle_course,
• gym_workout,
• aerobic_workout,
• housework,
• laughter_exercise,
• snorkeling,
• hunting,
• fighting,
• palpitation,
• sexual_relations,
• racing,
• water_aerobics,
• going_shopping,
• domestic_service,
• aggression,
• water-skiing,
• excavation_work,
• rugby,
• whiplash,
• gardening,
• yard_work,
• downhill_skiing,
• heavy_housework,
• aerobic_exercise,
• miscellaneous_service,
• vigorous_workout,
• playing_golf,
• housekeeping,
• sudden_change,
• playing_basketball,
• basket_ball,
• shift_work,
• bowling,
• fly_fishing,
• skiing,
• vigorous_exercise,
• exposure,
• parasailing,
• fatigue,
• sexual_activity,
• sailing,
• mountaineering,
• physical_labor,
• sport,
• heavy_gardening,
• competitive_tennis,
• dinner,
• playing_football,
• kick,
• work,
• workout,
• ballet,
• playing,
• backpacking,
• reading,
• shopping,
• fishing,
• athletics,
• fighting_crime,
• construction,
• inspection_work,
• snowboarding,