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But feeling better with a heel lift doesn’t automatically mean the tendon has regained the capacity to handle running, jumping, or heavier activity. That’s why gradually rebuilding calf and Achilles strength and increasing the tendon’s tolerance to load over time is needed.
It’s one reason seeing your arch drop a little or your foot spread under body weight doesn’t automatically mean you have “weak feet” or that something needs to be corrected.
Your nervous system is constantly deciding how much muscle to recruit and how strongly to drive it. Training your muscles also means training the system controlling them.
That faster signaling helps the muscle produce more force, especially when the task becomes demanding. This is called rate coding, and it’s one reason strength isn’t purely about muscle size.
But if the same area keeps feeling tight, it may also help to build strength and control through the range you already have instead of only trying to pull the muscle farther. In many cases, gradually loading the area helps it feel more comfortable and capable over time.
Context: A muscle can feel tight for a lot of reasons, and that sensation doesn’t automatically mean the tissue is physically too short. Sometimes stretching gives temporary relief, which is completely fine.
Most muscles contain a mixture of both, and training can influence how those fibers perform. Your muscles aren’t just getting stronger, they’re adapting to the kind of work you repeatedly ask them to do.
That doesn’t mean one type is “better” than the other. Endurance activities rely more heavily on fatigue resistant fibers, while sprinting, jumping, and heavy lifting depend more on higher force, faster fibers.