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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
    Side view of man and woman pulling ropes and working out in the gym. — Stock Photo
    Side view of man and woman pulling ropes and working out in the gym.
    Yoga instructor guiding senior woman in park — Stock Photo
    Yoga instructor guiding senior woman in park
    Chef and students with Down Syndrome using digital tablet in kitchen — Stock Photo
    Chef and students with Down Syndrome using digital tablet in kitchen
    Little boy and instructor splashing in swimming class on edge of pool. — Stock Photo
    Little boy and instructor splashing in swimming class on edge of pool.
    Happy girls learning horseback riding in sunny paddock — Stock Photo
    Happy girls learning horseback riding in sunny paddock
    Male trainer assisting female boxer in lifting barbell at fitness studio — Stock Photo
    Male trainer assisting female boxer in lifting barbell at fitness studio
    Coach helping a woman while practicing pilates in fitness studio — Stock Photo
    Coach helping a woman while practicing pilates in fitness studio
    Trainer performing yoga at yoga center — Stock Photo
    Trainer performing yoga at yoga center
    Tennis instructor working with teenage girl under sun. — Stock Photo
    Tennis instructor working with teenage girl under sun.
    Teen girl in tennis training on court with male instructor. — Stock Photo
    Teen girl in tennis training on court with male instructor.
    Boy in swim class with female instructor in swimming pool. — Stock Photo
    Boy in swim class with female instructor in swimming pool.
    Happy chinese rural female teacher standing near chalkboard in classroom — Stock Photo
    Happy chinese rural female teacher standing near chalkboard in classroom
    Yoga instructor in activewear sitting in lotus position while people lying on mats on ground during Shavasana in park in sunny day — Stock Photo
    Yoga instructor in activewear sitting in lotus position while people lying on mats on ground during Shavasana in park in sunny day
    Young asian woman doing yoga exercise on mat, prayer twist pose — Stock Photo
    Young asian woman doing yoga exercise on mat, prayer twist pose
    Portrait smiling artists painting at easel in art class studio — Stock Photo
    Portrait smiling artists painting at easel in art class studio
    Serene women meditating in yoga class gym studio — Stock Photo
    Serene women meditating in yoga class gym studio
    Child kicking punch bag in taekwondo class. — Stock Photo
    Child kicking punch bag in taekwondo class.
    Yoga instructor in activewear sitting in lotus position while people lying on mats on ground during Shavasana in park in sunny day — Stock Photo
    Yoga instructor in activewear sitting in lotus position while people lying on mats on ground during Shavasana in park in sunny day
    Sportive bearded male meditating on tranquil idyllic meadow against blue sky — Stock Photo
    Sportive bearded male meditating on tranquil idyllic meadow against blue sky
    Community college instructor and student talking in computer lab classroom — Stock Photo
    Community college instructor and student talking in computer lab classroom
    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
    Portrait smiling, confident businesswoman leading conference room meeting — Stock Photo
    Portrait smiling, confident businesswoman leading conference room meeting
    Physical therapist measuring teenage boy shin. — Stock Photo
    Physical therapist measuring teenage boy shin.
    Smiling female community college instructor leading lesson in classroom — Stock Photo
    Smiling female community college instructor leading lesson in classroom
    Swimming instructor giving water noodles to children in swimming pool. — Stock Photo
    Swimming instructor giving water noodles to children in swimming pool.
    Little boy in winter clothing learning skiing with father at snowy resort. — Stock Photo
    Little boy in winter clothing learning skiing with father at snowy resort.
    Active senior couple enjoying flower arranging class — Stock Photo
    Active senior couple enjoying flower arranging class
    Teenage tennis player training with male coach on tennis court. — Stock Photo
    Teenage tennis player training with male coach on tennis court.
    Instructor assisting pole dancer with correct pose in fitness studio — Stock Photo
    Instructor assisting pole dancer with correct pose in fitness studio
    Male trainer assisting female boxer in fitness studio — Stock Photo
    Male trainer assisting female boxer in fitness studio
    Grandfather and grandson boxing by lake outdoors. — Stock Photo
    Grandfather and grandson boxing by lake outdoors.
    Back view of female instructor in sportswear standing in tree pose and controlling group of sporty people concentrating and doing same exercise on sports mats in dark modern gym — Stock Photo
    Back view of female instructor in sportswear standing in tree pose and controlling group of sporty people concentrating and doing same exercise on sports mats in dark modern gym
    Young woman training with her Muay Thai trainer in a gym — Stock Photo
    Young woman training with her Muay Thai trainer in a gym
    Rural chinese female teacher and pupils smiling at camera in the classroom — Stock Photo
    Rural chinese female teacher and pupils smiling at camera in the classroom
    Fit men training over tyres obstacle course at boot camp — Stock Photo
    Fit men training over tyres obstacle course at boot camp
    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
    Fit men training over obstacle course at boot camp — Stock Photo
    Fit men training over obstacle course at boot camp
    Woman practices yoga at base of giant Sequoia Tree, California — Stock Photo
    Woman practices yoga at base of giant Sequoia Tree, California
    Happy chinese rural female teacher and pupils in classroom — Stock Photo
    Happy chinese rural female teacher and pupils in classroom
    Gay couple looking at camera in gym in the UK — Stock Photo
    Gay couple looking at camera in gym in the UK
    Fit man assisting his teammate to climb a wooden wall at boot camp — Stock Photo
    Fit man assisting his teammate to climb a wooden wall at boot camp
    Trainer helping woman while practicing pilates in fitness studio — Stock Photo
    Trainer helping woman while practicing pilates in fitness 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.
    Students with Down Syndrome looking at recipes in kitchen — Stock Photo
    Students with Down Syndrome looking at recipes in kitchen
    Active seniors practicing yoga in autumn park — Stock Photo
    Active seniors practicing yoga in autumn park
    Back view of balanced calm women and man sitting on lotus pose with mudra concentrated after on yoga class — Stock Photo
    Back view of balanced calm women and man sitting on lotus pose with mudra concentrated after on yoga class
    Business people talking, meeting at computer — Stock Photo
    Business people talking, meeting at computer
    Little boy learning swimming with female instructor in swimming pool. — Stock Photo
    Little boy learning swimming with female instructor in swimming pool.
    Little boy having swim class with female instructor in swimming pool. — Stock Photo
    Little boy having swim class with female instructor in swimming pool.
    Smiling man lunging in exercise class — Stock Photo
    Smiling man lunging in exercise class
    Tennis instructor training adolescent girl in summer. — Stock Photo
    Tennis instructor training adolescent girl in summer.
    Powerful sportsman in sportswear standing with black weight plate in hands and looking at camera during workout in gym — Stock Photo
    Powerful sportsman in sportswear standing with black weight plate in hands and looking at camera during workout in gym
    Young fit woman exercising with barbell while working out in gym. — Stock Photo
    Young fit woman exercising with barbell while working out in gym.
    Group of people in swimwear sitting at poolside and stretching raised arms while exercising during water aerobics training with instructor in pool — Stock Photo
    Group of people in swimwear sitting at poolside and stretching raised arms while exercising during water aerobics training with instructor in pool
    Sporty man and woman exercising with red balls in gym. — Stock Photo
    Sporty man and woman exercising with red balls in gym.
    Chinese children practicing Taekwondo stance with instructor — Stock Photo
    Chinese children practicing Taekwondo stance with instructor
    Powerful determined sportsman doing exercise with barbell at squat rack during weightlifting training with personal coach in modern gym — Stock Photo
    Powerful determined sportsman doing exercise with barbell at squat rack during weightlifting training with personal coach in modern gym
    Group of people in swimwear sitting at poolside and stretching raised arms while exercising during water aerobics training with instructor in pool — Stock Photo
    Group of people in swimwear sitting at poolside and stretching raised arms while exercising during water aerobics training with instructor in pool
    Trainer instructing group of senior women in performing yoga at yoga center — Stock Photo
    Trainer instructing group of senior women in performing yoga at yoga center