If you have a weak spot (shoulders, calves, hamstrings, etc) that you want to bring up, this news is huge.
Hell yes, according to sports scientists at the Universidade Federal do Rio de Janeiro (okay, so they would have said it in Portuguese, but you get the idea).
The scientists designed a training study with the Brazilian Navy to see if the order muscles are trained in effects their growth rates. The results were overwhelming.
The muscle group trained first was found to grow at a significantly faster rate than the muscles trained after it – and the muscle group trained first gained the most strength as well. All the muscle groups trained gained size and strength, but the rate of change was noticeably higher in muscles targeted by the first lifts.The Brazilian study strongly supports the strategy that muscle groups you want to emphasize should be trained first in your workouts.