At this age (well, at every age) it is imperative to get enough rest between exercise days. The heart rate variability (HRV, there are apps for that) is a good indicator.
For muscle growth I can from personal experience highly recommend Glycine (available from vegan sources). It can be used as sweetener while helping keep blood glucose down. One study found it can boost muscle growth 400% in young pigs.
For muscle growth I can from personal experience highly recommend Glycine (available from vegan sources). It can be used as sweetener while helping keep blood glucose down. One study found it can boost muscle growth 400% in young pigs.
Glycine study performed on young pigs: https://academic.oup.com/jn/article/144/10/1540/4575112
Here’s one on mouse muscle cells: https://academic.oup.com/jn/article/146/12/2461/4589973