It would be important to realize that activation of PGC-1 {alpha} and {beta} has severe side effects that can occur during a treatment:

Below a summary about the possible problems:
- When PGC-1 {alpha} or {beta} are higher in the muscle, tumor necrosis factor {alpha} (TNF {alpha}) is elevated. More TNF {alpha}, a mediator of inflammation, is secreted into the blood (cf. Olesen J et al; Medicine & Science in Sports & Exercise: October 2010 - Volume 42 - Issue 10 - p 58.
- The same article shows this at basal levels and that it worsens following injection of TNF into muscle.
- When PGC-1 is elevated more lipids are accumulating in muscle. People can become obese. Lipids often induce inflammation (cf. Summermatter S et al; Journal of biological chemistry: October 2010 22;285(43):32793-800)
- Then PGC-1 can even induce diabetes when too high (cf. Miura S, Journal of biological chemistry: August 2003 15;278(33):31385-90.)
- High PGC-1 {alpha} and {beta} levels, basal and after stimulation by TNF or Lipopolysaccharide (LPS) lead to high expression and release of inflammatory IL (interleukin) and of macrophage infiltration as indicated by CD (cluster of differentiation)

All this should be kept in mind. Maybe it's still ok to develop drugs that promote PGC-1, but it should be considered that this can have these side effects.