Vervet monkey displaying aggression, Zimbabwe, Africa

Caucasian man playing tug-of-war with dog in snow

Two paraplegic friends pretending to arm wrestle after working out at a fitness facility: Sherwood Park, Alberta, Canada

A paraplegic woman popping wheelie in her wheelchair and fooling around in a gymnasium after working out at a fitness facility: Sherwood Park, Alberta, Canada

Men swimming in the icy glacial lakes of Mount Cook National Park; Canterbury, New Zealand