There are several key components to building long, lean muscle, starting with striking the right balance of strength training sets/reps and burning excess fat.

The news: Myosana Therapeutics, a Seattle startup developing gene therapy technology, raised $5 million to develop an early-stage candidate treatment for Duchenne muscular dystrophy (DMD).

But she adds that not all hope is lost. “It really is the neurology, as well as the muscular system and the interactions between the two, that changes,” she says. “And there’s a fair ...