Beware of false prophets bearing gifts! There are many silver tonged devils out there who needlessly complicate simple things and are then selling you machines to measure or train those things. Machines that flash red lights and sound sirens are seductive, but they can’t replace a good coach.
Have a good filter, know the basics and don’t stray from the basics. Don’t be fooled by the smooth foreign accents or the degrees, recognize them for what they are – snake oil salesmen. There are no shortcuts!