Nice article. People have different schools of thoughts on Isometrics Ive tested out alot and certainly burnt myself out with Isometrics. My fav workout is a steve Justa workout, 70-100 positions for a 7 second 90 percent hold alll body muscles what ever exercises you want moving as quick as possible. I think for many Isometrics need recovery, few times a week is usually enough, i also believe one should include blood pumping exercises on same or alternate days.