“there is no point in doing 100 push ups if they are all done with poor execution and in bad form”

You will achieve far better quality of movement, posture and physical outcomes when you pay attention to the detail of the exercise and the precision of its execution. Quality always trumps quantity— there is no point in doing 100 push ups if they are done with poor execution and form which leads to muscle imbalance, movement dysfunction and potential injury. It’s much better to do fewer repetitions, making sure they are done correctly and in good form.