I use isometric and quasi-isometric work all the time but it isn’t the focus of the training. Two things that limit isometric work for true, functional, applicable strength development is that fully isometric contractions rarely occur in sporting movements and also, any gains in strength from isometric strength work are limited to +/- 15 degrees of the trained hold angle. Nonetheless, there’s some form of it in every training plan I design with the integration varying from very general calisthenic work to high intensity strength work to speed-power development stuff.
ELITETRACK Founder