how to do a push up

Just saw a big outdoor group doing push ups with really poor form. Guys, quick tips for push ups: fingers pointing forwards and spread apart (to take pressure of wrists),

back of head, middle of shoulder blades and bum all in a straight line, lower and raise keeping the line and position. Make sure your lower back doesn’t arch. If you are unable to maintain this position on the floor regress the exercise to a bench or even a wall if you’re a beginner. Don’t do push ups on your knees, change the angle instead.