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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
    Instructor explaining kicking technique for children in class. — Stock Photo
    Instructor explaining kicking technique for children in class.
    Businesswoman leading conference room meeting — Stock Photo
    Businesswoman leading conference room meeting
    Focused artists painting at easel in art class studio — Stock Photo
    Focused artists painting at easel in art class studio
    Coach with teenage tennis player practicing serving. — Stock Photo
    Coach with teenage tennis player practicing serving.
    Chinese instructor and Taekwondo student bowing in exercise room — Stock Photo
    Chinese instructor and Taekwondo student bowing in exercise room
    Side view of flexible girl sitting in split and stretching legs with help of dance trainer before lesson in spacious hall — Stock Photo
    Side view of flexible girl sitting in split and stretching legs with help of dance trainer before lesson in spacious hall
    Fit young female in sportswear with rolled yoga mat in hand smiling and looking at camera while preparing for class in fitness studio — Stock Photo
    Fit young female in sportswear with rolled yoga mat in hand smiling and looking at camera while preparing for class in fitness studio
    Fit senior man exercising outdoors — Stock Photo
    Fit senior man exercising outdoors
    Athletic strong fellows doing workout with weight in gym — Stock Photo
    Athletic strong fellows doing workout with weight in gym
    Young asian woman standing near window — Stock Photo
    Young asian woman standing near window
    Community college instructor helping student with headphones at computer in computer lab classroom — Stock Photo
    Community college instructor helping student with headphones at computer in computer lab classroom
    Rural female teacher and pupils using laptop computer together in school — Stock Photo
    Rural female teacher and pupils using laptop computer together in school
    Positive young plus size female with curly dark hair in casual clothes smiling while walking on city street with rolled mat before yoga session in sunny morning — Stock Photo
    Positive young plus size female with curly dark hair in casual clothes smiling while walking on city street with rolled mat before yoga session in sunny morning
    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
    Young male and female boxer using mobile phone at fitness day — Stock Photo
    Young male and female boxer using mobile phone at fitness day
    Artists painting in art class studio — Stock Photo
    Artists painting in art class studio
    Teen boy in sportswear stretching legs before football training with help of male coach in green field — Stock Photo
    Teen boy in sportswear stretching legs before football training with help of male coach in green field
    Female art students listening to instructor in art painting class workshop — Stock Photo
    Female art students listening to instructor in art painting class workshop
    Fitness instructor guiding woman in exercise class — Stock Photo
    Fitness instructor guiding woman in exercise class
    Surfer instructor teaching family on surfboards surfing on sunny summer sunset beach — Stock Photo
    Surfer instructor teaching family on surfboards surfing on sunny summer sunset beach
    View from above high school teacher supervising students taking exam — Stock Photo
    View from above high school teacher supervising students taking exam
    Senior adults practicing yoga in sunny park — Stock Photo
    Senior adults practicing yoga in sunny park
    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
    Active seniors stretching, exercising in autumn park — Stock Photo
    Active seniors stretching, exercising in autumn park
    Chef guiding student with Down Syndrome kneading dough — Stock Photo
    Chef guiding student with Down Syndrome kneading dough
    Full length of yoga instructor teaching young female beginner to do Tree pose during yoga class in studio — Stock Photo
    Full length of yoga instructor teaching young female beginner to do Tree pose during yoga class in studio
    Instructor teaching rescue rope techniques on the ground — Stock Photo
    Instructor teaching rescue rope techniques on the ground
    Side view of calm female in white activewear performing Halasana on mat on ground in park against green trees and cloudless blue sky in sunny day — Stock Photo
    Side view of calm female in white activewear performing Halasana on mat on ground in park against green trees and cloudless blue sky in sunny day
    Female art students working in art studio — Stock Photo
    Female art students working in art studio
    Little boy having swim class with female instructor in swimming pool. — Stock Photo
    Little boy having swim class with female instructor in swimming pool.
    Young asian sporty woman making yoga — Stock Photo
    Young asian sporty woman making yoga
    Tennis instructor practicing with senior man in tennis lesson. — Stock Photo
    Tennis instructor practicing with senior man in tennis lesson.
    Side view of unrecognizable focused female in sportswear sitting on floor and watching climber on wall during workout in gym — Stock Photo
    Side view of unrecognizable focused female in sportswear sitting on floor and watching climber on wall during workout in gym
    Concentrated female trainer in sportswear teaching man meditating posture pose during yoga session in studio — Stock Photo
    Concentrated female trainer in sportswear teaching man meditating posture pose during yoga session in studio
    Smiling female artists painting in art class workshop — Stock Photo
    Smiling female artists painting in art class workshop
    Side view of people boxing in green park — Stock Photo
    Side view of people boxing in green park
    Side view of active sportive women preparing to acroyoga position in wooden stand on sandy beach — Stock Photo
    Side view of active sportive women preparing to acroyoga position in wooden stand on sandy beach
    Group of fit people giving a high five for motivation outdoors — Stock Photo
    Group of fit people giving a high five for motivation outdoors
    Middle-aged Latin woman, with yellow top, black leguin, with dumbbells, gymnastics, warmed up for training, burn calories, keep fit, outdoors by sea, blue sky, beautiful day, sunny winter, bl — Stock Photo
    Middle-aged Latin woman, with yellow top, black leguin, with dumbbells, gymnastics, warmed up for training, burn calories, keep fit, outdoors by sea, blue sky, beautiful day, sunny winter, bl
    Grandfather and grandson boxing by lake outdoors. — Stock Photo
    Grandfather and grandson boxing by lake outdoors.
    Trainer assisting women in exercising with dumbbells at fitness studio. — Stock Photo
    Trainer assisting women in exercising with dumbbells at fitness studio.
    Side view of boxer man punching gloves of trainer in the gym. — Stock Photo
    Side view of boxer man punching gloves of trainer in the gym.
    Grandfather and grandson enjoying rollerskating in summer park. — Stock Photo
    Grandfather and grandson enjoying rollerskating in summer park.
    High school teacher supervising students taking exam at tables — Stock Photo
    High school teacher supervising students taking exam at tables
    Instructor guiding students in dance class studio — Stock Photo
    Instructor guiding students in dance class studio
    Smiling female instructor helping man doing exercises on pilates reformer during training in gym — Stock Photo
    Smiling female instructor helping man doing exercises on pilates reformer during training in gym
    Little boy having swim class with female instructor in swimming pool. — Stock Photo
    Little boy having swim class with female instructor in swimming pool.
    Chinese ballet instructor teaching girls in ballet studio — Stock Photo
    Chinese ballet instructor teaching girls in ballet studio
    Smiling female and male trainer in protective helmets strolling with stallions on sandy terrain under cloudy sky — Stock Photo
    Smiling female and male trainer in protective helmets strolling with stallions on sandy terrain under cloudy sky
    Instructor with group of children having fun in swimming school. — Stock Photo
    Instructor with group of children having fun in swimming school.
    Preschooler boy in ski goggles having skiing lesson. — Stock Photo
    Preschooler boy in ski goggles having skiing lesson.
    Young asian woman doing warrior one pose — Stock Photo
    Young asian woman doing warrior one pose
    Children in swimming class making bubbles in public pool. — Stock Photo
    Children in swimming class making bubbles in public pool.
    Happy chinese rural female teacher standing near chalkboard in classroom — Stock Photo
    Happy chinese rural female teacher standing near chalkboard in classroom
    People practicing during dance class — Stock Photo
    People practicing during dance class
    Senior business people in conference room meeting — Stock Photo
    Senior business people in conference room meeting
    Swimming instructor with children using kicking boards in swimming pool. — Stock Photo
    Swimming instructor with children using kicking boards in swimming pool.
    African American woman and caucasian man with sports bag in hand walking together along wall of city construction — Stock Photo
    African American woman and caucasian man with sports bag in hand walking together along wall of city construction
    Asian woman working with trainer at gym — Stock Photo
    Asian woman working with trainer at gym