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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
    Cheerful sporty man and woman sitting in gym and browsing smartphones. — Stock Photo
    Cheerful sporty man and woman sitting in gym and browsing smartphones.
    Happy chinese rural female teacher standing near chalkboard in classroom — Stock Photo
    Happy chinese rural female teacher standing near chalkboard in classroom
    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.
    Confident woman in boxing gloves standing in gym — Stock Photo
    Confident woman in boxing gloves standing in gym
    Preschooler boy skiing with male instructor. — Stock Photo
    Preschooler boy skiing with male instructor.
    Physical therapist helping a patient to ride an exercise bike — Stock Photo
    Physical therapist helping a patient to ride an exercise bike
    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
    Side view of young muscular man in sportswear training with elastic resistance bands during intense workout with friend in modern gym — Stock Photo
    Side view of young muscular man in sportswear training with elastic resistance bands during intense workout with friend in modern gym
    Male instructor leading dance class in studio mirror — Stock Photo
    Male instructor leading dance class in studio mirror
    Smiling baby boy in swimming pool water in male hands. — Stock Photo
    Smiling baby boy in swimming pool water in male hands.
    Grandfather and grandson boxing by lake outdoors. — Stock Photo
    Grandfather and grandson boxing by lake outdoors.
    Students watching chef teacher in cooking class kitchen — Stock Photo
    Students watching chef teacher in cooking class kitchen
    Fit people training over tires obstacle course at boot camp — Stock Photo
    Fit people training over tires obstacle course at boot camp
    Young woman with Down Syndrome flouring surface in baking class — Stock Photo
    Young woman with Down Syndrome flouring surface in baking class
    Girl cleaning horse hoof outside stables — Stock Photo
    Girl cleaning horse hoof outside stables
    Adult woman in boxing gloves standing in fighting position — Stock Photo
    Adult woman in boxing gloves standing in fighting position
    Rural female teacher and chinese pupils using laptop computer together in school — Stock Photo
    Rural female teacher and chinese pupils using laptop computer together in school
    Fit people training over obstacle course at boot camp — Stock Photo
    Fit people training over obstacle course at boot camp
    Trainer assisting male boxer to wear headgear in fitness studio — Stock Photo
    Trainer assisting male boxer to wear headgear in fitness studio
    Balanced calm women and man teacher helping correcting poses while they stretching and raising hands up in warrior one posture on yoga class — Stock Photo
    Balanced calm women and man teacher helping correcting poses while they stretching and raising hands up in warrior one posture on yoga class
    Happy girls learning horseback riding in sunny paddock — Stock Photo
    Happy girls learning horseback riding in sunny paddock
    Senior business people in conference room meeting — Stock Photo
    Senior business people in conference room meeting
    Young woman with Down Syndrome cutting dough in baking class — Stock Photo
    Young woman with Down Syndrome cutting dough in baking class
    Young asian woman doing stretching exercises against wall — Stock Photo
    Young asian woman doing stretching exercises against wall
    People preparing zip line equipment — Stock Photo
    People preparing zip line equipment
    Woman pulling ropes and working out in the gym — Stock Photo
    Woman pulling ropes and working out in the gym
    Glad female with cup of tea smiling and speaking with yoga teacher during teatime — Stock Photo
    Glad female with cup of tea smiling and speaking with yoga teacher during teatime
    Fit men training over obstacle course at boot camp — Stock Photo
    Fit men training over obstacle course at boot camp
    Sportive man giving high five to his personal coach after training — Stock Photo
    Sportive man giving high five to his personal coach after training
    Chinese children exercising with Taekwondo instructor — Stock Photo
    Chinese children exercising with Taekwondo instructor
    Cheerful woman stretching leg on blue hammock for aerial yoga on wooden stage — Stock Photo
    Cheerful woman stretching leg on blue hammock for aerial yoga on wooden stage
    Friends preparing zip line equipment, putting on helmets — Stock Photo
    Friends preparing zip line equipment, putting on helmets
    Pilates trainer helping woman while practicing in fitness studio — Stock Photo
    Pilates trainer helping woman while practicing in fitness studio
    Taekwondo instructor working with child. — Stock Photo
    Taekwondo instructor working with child.
    Active seniors enjoying flower arranging class — Stock Photo
    Active seniors enjoying flower arranging class
    Little boy having swim class with female instructor in swimming pool. — Stock Photo
    Little boy having swim class with female instructor in swimming pool.
    Rural female teacher and happy chinese pupils in classroom — Stock Photo
    Rural female teacher and happy chinese pupils in classroom
    Yoga instructor talking to senior men after class in park — Stock Photo
    Yoga instructor talking to senior men after class in park
    Back view of unrecognizable focused female alpinist in sportswear sitting on floor and watching climber on wall during workout in gym — Stock Photo
    Back view of unrecognizable focused female alpinist in sportswear sitting on floor and watching climber on wall during workout in gym
    People talking in support group meeting circle — Stock Photo
    People talking in support group meeting circle
    Lady doing plank exercise with personal instructor in gym — Stock Photo
    Lady doing plank exercise with personal instructor in gym
    Instructor discussing air conditioner recharging with student in wheelchair in HVAC classroom — Stock Photo
    Instructor discussing air conditioner recharging with student in wheelchair in HVAC classroom
    Coach helping a woman while practicing pilates in fitness studio — Stock Photo
    Coach helping a woman while practicing pilates in fitness studio
    Male professor using laptop next to projection screen in classroom — Stock Photo
    Male professor using laptop next to projection screen in classroom
    Senior teacher of rollerskating with boy practicing on class in park. — Stock Photo
    Senior teacher of rollerskating with boy practicing on class in park.
    Elementary age children in taekwondo class with trainer. — Stock Photo
    Elementary age children in taekwondo class with trainer.
    Calm women and man concentrated on stretching doing high lunge pose on yoga class — Stock Photo
    Calm women and man concentrated on stretching doing high lunge pose on yoga class
    Female yoga instructor demonstrating forward fold in hut during yoga retreat — Stock Photo
    Female yoga instructor demonstrating forward fold in hut during yoga retreat
    Senior business people working, using digital tablets in conference room meeting — Stock Photo
    Senior business people working, using digital tablets in conference room meeting
    Low angle back view of female trainer supporting male alpinist in harness climbing artificial wall in bouldering center — Stock Photo
    Low angle back view of female trainer supporting male alpinist in harness climbing artificial wall in bouldering center
    Cute baby boy swimming with instructor and mother in pool water. — Stock Photo
    Cute baby boy swimming with instructor and mother in pool water.
    Young barefoot female trainer standing on tiptoes while helping female athlete performing Transition Up Pole pose during class — Stock Photo
    Young barefoot female trainer standing on tiptoes while helping female athlete performing Transition Up Pole pose during class
    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.
    Community college instructor helping students with paperwork in classroom — Stock Photo
    Community college instructor helping students with paperwork in classroom
    Teen girl in tennis training on court with male instructor. — Stock Photo
    Teen girl in tennis training on court with male instructor.
    Young barefoot female trainer standing on tiptoes while helping female athlete performing pole pose during class — Stock Photo
    Young barefoot female trainer standing on tiptoes while helping female athlete performing pole pose during class
    Fit senior man running outdoors — Stock Photo
    Fit senior man running outdoors
    Zip line students watching instructor — Stock Photo
    Zip line students watching instructor
    Instructor teaching rescue rope techniques on the ground — Stock Photo
    Instructor teaching rescue rope techniques on the ground