Generally, people will run a steroid cycle, do a PCT, take some time off and then run another steroid cycle.
Blasting and cruising is when you do a steroid cycle, but then instead of doing a PCT and taking time off, you stay on a testosterone replacement therapy dosage of testosterone (usually around 200mg/week) for 10-16 weeks before doing another cycle. In other words, you skip the PCT and time off in between cycles and use a low dosage of testosterone during that time instead.
The simplest blast and the best option for a first blast would be to simply increase your TRT dosage of testosterone to 500mg/week for 10-12 weeks.
After the 10-12 weeks, return to your TRT dosage for 10-12 weeks before doing another blast.
Just a quick tip - you need to be using an AI when cruising and blasting. An AI keeps estrogen in the low-normal range and prevents estrogen related side effects like gyno and water retention. This is very important.
On TRT - aromasin at 5mg EOD is a good dosage
When blasting - aromasin at 10mg EOD is a good dosage
The body grows best and burns fat optimally with low-normal estrogen levels. High estrogen levels promote fat storage.