CFTR and skeletal muscle disorder: Importantly, the Adv‐CFTR treatment for 2 weeks increased the contractility (Figure 5D), mass (Figure 5E, Figure S6B), fast/slow‐twitch muscle isoform ratio (Figure 5F), and myofiber CSA (Figure S6C) of the treated gastrocnemii, compared to the Adv‐Ctrl treated ones, suggesting the potential of enhancing CFTR in rescuing skeletal muscle disorders.