Cruise: maintaining a low dose, could be considered TRT dose if you’re on TRT, of testosterone for a length of time before using additional compounds again.
Blast: Another name for “cycle” by guys that do a “cruise.”
Basically it’s all bullshit made up to make guys feel better about never coming off of AAS lol. If you aren’t on TRT and you come off of all compounds, including testosterone and you PCT, then you just do “cycles.” If you stay on testosterone year round but also do cycles with other compounds then you are “blasting and cruising.”