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    Professor discussing sensors and thermostats with students in an HVAC classroom — Stock Photo
    Professor discussing sensors and thermostats with students in an HVAC classroom
    Young asian woman sitting on mat — Stock Photo
    Young asian woman sitting on mat
    Personal trainer helping client in gym — Stock Photo
    Personal trainer helping client in gym
    Female paramedic CPR training on baby dummy with instructor outdoors. — Stock Photo
    Female paramedic CPR training on baby dummy with instructor outdoors.
    Athletic African American woman in top and leggings jogging with sportive male friend next to modern city construction — Stock Photo
    Athletic African American woman in top and leggings jogging with sportive male friend next to modern city construction
    Teenage tennis player training with male coach on tennis court. — Stock Photo
    Teenage tennis player training with male coach on tennis court.
    Trainer helping woman with exercise — Stock Photo
    Trainer helping woman with exercise
    Full body of young female with instructor standing in Upward Salute Side Bend pose while practicing yoga together in modern fitness studio — Stock Photo
    Full body of young female with instructor standing in Upward Salute Side Bend pose while practicing yoga together in modern fitness studio
    Instructor training students about air conditioning units in HVAC classroom — Stock Photo
    Instructor training students about air conditioning units in HVAC classroom
    Young asian woman lying on mat with closed eyes — Stock Photo
    Young asian woman lying on mat with closed eyes
    Athletic man giving support to active African American woman in performing of stretching exercise during workout — Stock Photo
    Athletic man giving support to active African American woman in performing of stretching exercise during workout
    Taekwondo instructor training little boy in class. — Stock Photo
    Taekwondo instructor training little boy in class.
    Back view of unrecognizable people in sport clothes sitting on mats and doing Padmasana while practicing yoga in yard in summer — Stock Photo
    Back view of unrecognizable people in sport clothes sitting on mats and doing Padmasana while practicing yoga in yard in summer
    Flexible female stretching legs with help of personal instructor while doing exercises on pilates reformer — Stock Photo
    Flexible female stretching legs with help of personal instructor while doing exercises on pilates reformer
    Two men exercising on obstacle course at boot camp — Stock Photo
    Two men exercising on obstacle course at boot camp
    Tennis instructor working with senior man and practicing position for forehand stroke. — Stock Photo
    Tennis instructor working with senior man and practicing position for forehand stroke.
    Full length of yoga instructor helping woman doing seated twist Half Lord of the Fishes pose during class in studio — Stock Photo
    Full length of yoga instructor helping woman doing seated twist Half Lord of the Fishes pose during class in studio
    Young asian women exercising outdoors — Stock Photo
    Young asian women exercising outdoors
    Instructor with baby boy and mother practicing in pool. — Stock Photo
    Instructor with baby boy and mother practicing in pool.
    Fit men training over obstacle course at boot camp — Stock Photo
    Fit men training over obstacle course at boot camp
    Man with spinal cord injury in an adaptive cart at golf putting green with an instructor — Stock Photo
    Man with spinal cord injury in an adaptive cart at golf putting green with an instructor
    Fitness trainer and senior woman doing physiotherapy exercises with step platform and elastic band — Stock Photo
    Fitness trainer and senior woman doing physiotherapy exercises with step platform and elastic band
    Side view of athletic strong fellows doing workout with weight in gym — Stock Photo
    Side view of athletic strong fellows doing workout with weight in gym
    A girl exercising her back on the pilates reformer — Stock Photo
    A girl exercising her back on the pilates reformer
    Front view of a middle aged Caucasian male instructor giving self defence training in a boxing gym demonstrating a hold on a lying young mixed race man, while another young man looks on — Stock Photo
    Front view of a middle aged Caucasian male instructor giving self defence training in a boxing gym demonstrating a hold on a lying young mixed race man, while another young man looks on
    Swimming instructor with children in swimming pool. — Stock Photo
    Swimming instructor with children in swimming pool.
    Side view of strong healthy woman stretching in bridge posture in acroyoga and watching inspired long haired partner on wooden stand on seaside — Stock Photo
    Side view of strong healthy woman stretching in bridge posture in acroyoga and watching inspired long haired partner on wooden stand on seaside
    Side view of adult man with cigar training boxer in the gym. — Stock Photo
    Side view of adult man with cigar training boxer in the gym.
    Trainer helping woman while practicing pilates in fitness studio — Stock Photo
    Trainer helping woman while practicing pilates in fitness studio
    Senior lady during exercise with trainer using equipment in gym — Stock Photo
    Senior lady during exercise with trainer using equipment in gym
    Cute kids having lesson with instructor in swimming pool. — Stock Photo
    Cute kids having lesson with instructor in swimming pool.
    Portrait smiling active seniors enjoying flower arranging class — Stock Photo
    Portrait smiling active seniors enjoying flower arranging class
    Female paramedic CPR training on dummy with instructor outdoors. — Stock Photo
    Female paramedic CPR training on dummy with instructor outdoors.
    Female volleyball coach interacting with female players on the beach — Stock Photo
    Female volleyball coach interacting with female players on the beach
    Female with male trainer riding stallions in countryside on sunny day — Stock Photo
    Female with male trainer riding stallions in countryside on sunny day
    Physical therapist performing foot pressure scan for child. — Stock Photo
    Physical therapist performing foot pressure scan for child.
    Focused young female instructor standing in Warrior II position while practicing yoga with student in modern fitness studio — Stock Photo
    Focused young female instructor standing in Warrior II position while practicing yoga with student in modern fitness studio
    From below of brave female athlete climbing artificial wall in bouldering center under supervision of professional instructor — Stock Photo
    From below of brave female athlete climbing artificial wall in bouldering center under supervision of professional instructor
    Boy with board splashing in swimming class with instructor in public pool. — Stock Photo
    Boy with board splashing in swimming class with instructor in public pool.
    Back view of sportive man standing on hands in gym. — Stock Photo
    Back view of sportive man standing on hands in gym.
    Swimming instructor with happy little girl in swimming pool. — Stock Photo
    Swimming instructor with happy little girl in swimming pool.
    Chef teacher and students toasting wine glasses in cooking class kitchen — Stock Photo
    Chef teacher and students toasting wine glasses in cooking class kitchen
    High school teacher supervising students taking exam at desks — Stock Photo
    High school teacher supervising students taking exam at desks
    Hands of physical therapist performing skinfold test to measuring teenage boy body fat. — Stock Photo
    Hands of physical therapist performing skinfold test to measuring teenage boy body fat.
    Serene women meditating in yoga class gym studio — Stock Photo
    Serene women meditating in yoga class gym studio
    Hands of unrecognizable medic checking the eye of the boxer on boxing ring. — Stock Photo
    Hands of unrecognizable medic checking the eye of the boxer on boxing ring.
    Young male and female boxer using mobile phone at fitness day — Stock Photo
    Young male and female boxer using mobile phone at fitness day
    Woman with paramedic instructor CPR training on dummy outdoors. — Stock Photo
    Woman with paramedic instructor CPR training on dummy outdoors.
    From below of female doing pull ups on horizontal bar with help of instructor while training in modern climbing center — Stock Photo
    From below of female doing pull ups on horizontal bar with help of instructor while training in modern climbing center
    Instructor supervising high school students taking exam at desks — Stock Photo
    Instructor supervising high school students taking exam at desks
    Female paramedic CPR training with instructor on baby dummy outdoors. — Stock Photo
    Female paramedic CPR training with instructor on baby dummy outdoors.
    Chef helping young female student with Down Syndrome in kitchen — Stock Photo
    Chef helping young female student with Down Syndrome in kitchen
    Full body of fit barefoot young female in sportswear with rolled yoga mat in hand smiling and looking at camera while preparing for class in fitness studio — Stock Photo
    Full body of fit barefoot young female in sportswear with rolled yoga mat in hand smiling and looking at camera while preparing for class in fitness studio
    Fit men training over obstacle course at boot camp — Stock Photo
    Fit men training over obstacle course at boot camp
    Boy kicking punching bag in taekwondo class. — Stock Photo
    Boy kicking punching bag in taekwondo class.
    From above of unrecognizable male doing yoga in Standing Forward Bend pose with help of crop personal trainer — Stock Photo
    From above of unrecognizable male doing yoga in Standing Forward Bend pose with help of crop personal trainer
    Smiling fitness instructor leading exercise class stretching arms — Stock Photo
    Smiling fitness instructor leading exercise class stretching arms
    Fit men training over tyres obstacle course at boot camp — Stock Photo
    Fit men training over tyres obstacle course at boot camp
    High school teacher supervising students taking exam at desks — Stock Photo
    High school teacher supervising students taking exam at desks
    Chef helping students with Down Syndrome in baking class — Stock Photo
    Chef helping students with Down Syndrome in baking class