Cruise is about being on certain dose of test that will allow both your bloodwork to recover (mainly cholesterol values) and to keep your gains from the previous blast.
Its counter productive to perma blast even if you dont care about health since you will become imune to the muscle building effects of gear over time, not because of receptors but more because of myostatin.
People usually cruise range are 100mg to 500mg of test a week. Usually most guys use 200-250mg.
