First of all,the rock did not get implants,he had a slight case of gyno as prof x said.he got the gyno removed around 1999,he never wore any vests just a t-shirt during this period after he had the gyno fixed.
What a body?? Sure but genetics play a huge part,have a look at the rocks dad,one big muscular mutha.
That pic of rock u posted,he was around 240 pounds ,back when he was HUGE he weighed in around 270-280.
But u can easily find out rock's training program by doing a bit of searching.