Alex Rodriguez — who posted before-and-after pics of his weight loss this week with the caption “Left the Dad-bod in 2020” — has been participating in a $4,000 workout program.

The program costs a whopping $4,000 and lasts nine weeks.

Back in March, A-Rod, 45, posted a picture of himself at the gym and, according to the owner, was devoted to sweating it out?

“A-Rod showed amazing commitment during our 54-day program,” workout founder Rodrigo Garduño tells Page Six.

The workout consists of HIIT training, cardio and weightlifting.

The plan also offers workout recovery programs — like freezing cold cryotherapy and Normatec boots, which cover the leg and offer pulse compression, we hear