Here some woman who teaches body pendulum for selftesting:
Debs Holistically Healthy: Applied Kinesiology - muscle testing
Actually it is not objective at all.
She tests products if it is good for her or not..
For sure if she had an healthy apple in her hand and she tested 'NO' she would explain it as.. 'Oooh, than NOW, for this moment, this apple is not good for me.
Pffff...