Does low-intensity calf raises with straight knees only work superficial calf muscles?

We analyzed the available research and found that 27 studies support, 0 studies refute this pattern. When we look at what we have gathered so far, the data suggests that keeping your knees straight during low-intensity calf raises directs the effort toward the outer and back sections of your lower leg ¹. This means the deeper calf muscles and the muscles in your shin do not get much stimulation during this exact version of the exercise. We want to be clear that our current analysis is based on the evidence we have reviewed up to this point, and our understanding continues to improve as more information becomes available. The evidence we have reviewed leans toward the conclusion that straight-knee, light resistance training specifically targets the more superficial muscles in your calves.

If you are trying to build strength in your lower legs, this movement may be a good choice if your goal is to focus on the outer and back areas. You can pair it with other exercises that bend your knees or use heavier weights to make sure you are also engaging the deeper muscles. We will keep tracking new findings to give you the most accurate picture as time goes on.