Taking a brief stretch between sets of weightlifting might build slow-twitch muscles more than fast-twitch ones. This could happen because slow-twitch muscles are more sensitive to the physical stretching signals that tell them to grow.

Adding a short, weighted stretch between workout sets might help build a bit more calf muscle in beginners compared to just resting. This quick stretch could specifically target the slow-twitch muscle fibers without making your workout take longer.

Doing a short, weighted stretch between workout sets doesn't reliably make your calf muscles grow bigger compared to just resting normally. This suggests that stretching between sets might only help certain muscles, rather than working for every muscle group.

Resistance training to muscular failure induces equivalent hypertrophy in both slow-twitch (type I) and fast-twitch (type II) muscle fibers, regardless of load or repetition range.

Lifting lighter weights with more reps might make your slow-twitch muscles grow bigger than lifting heavier weights with fewer reps.

Lifting heavier weights makes your fast-twitch muscle fibers grow bigger than lifting lighter weights does.