[nonameiguess]

They may do better than unenhanced humans (a fair number of eastern bloc records from the pre-testing era still stand today, especially in women's throwing events), but they're not going to exceed any hard biomechanical limits. No drug can grow more type II fibers or change the firing rate of the nerves.

The one extreme option out there is surgery to change the attachment point of the tendon to the bone, generating more torque from the same contractile force. Some possibly acropyphal rumors claim lifters in nations with very unscrupulous doctors may have done that when the opportunity presented itself because of an incidental muscle tear.

[gadders]

I agree in that they won't make bones tougher or tendons more elastic. They maybe able to add more TypeII fibres though if they grow additional muscle?

The other big thing on the horizon is gene doping, such as with Myostatin in Bully Whippets.