[求解] 小腿內側硬硬的...

<p><span style="color: rgb(0, 0, 0); font-family: '.SFNSDisplay-Regular', '.PingFang-TC-Regular', 'PingFang TC', Helvetica, Verdana, 新細明體, PMingLiU, sans-serif; letter-spacing: 1.50781px; line-height: 22.6172px;">網上爬文都說肌肉放鬆時是軟的，用力時才會變硬(若這觀念不對還請水水們糾正)。</span><br style="letter-spacing: 0em; color: rgb(0, 0, 0); font-family: '.SFNSDisplay-Regular', '.PingFang-TC-Regular', 'PingFang TC', Helvetica, Verdana, 新細明體, PMingLiU, sans-serif; font-size: 15.0781px; line-height: 22.6172px; -shadow: none !important;" /> <span style="color: rgb(0, 0, 0); font-family: '.SFNSDisplay-Regular', '.PingFang-TC-Regular', 'PingFang TC', Helvetica, Verdana, 新細明體, PMingLiU, sans-serif; letter-spacing: 1.50781px; line-height: 22.6172px;">那小腿內側在沒出力的狀態下，有一小塊硬硬的(雙腳都有)，用力捏會酸酸的...</span><br style="letter-spacing: 0em; color: rgb(0, 0, 0); font-family: '.SFNSDisplay-Regular', '.PingFang-TC-Regular', 'PingFang TC', Helvetica, Verdana, 新細明體, PMingLiU, sans-serif; font-size: 15.0781px; line-height: 22.6172px; -shadow: none !important;" /> <span style="color: rgb(0, 0, 0); font-family: '.SFNSDisplay-Regular', '.PingFang-TC-Regular', 'PingFang TC', Helvetica, Verdana, 新細明體, PMingLiU, sans-serif; letter-spacing: 1.50781px; line-height: 22.6172px;">請問這是肌肉? 脂肪? 還是什麼構造? 有辦法讓他變軟嗎? </span><br style="letter-spacing: 0em; color: rgb(0, 0, 0); font-family: '.SFNSDisplay-Regular', '.PingFang-TC-Regular', 'PingFang TC', Helvetica, Verdana, 新細明體, PMingLiU, sans-serif; font-size: 15.0781px; line-height: 22.6172px; -shadow: none !important;" /> <span style="color: rgb(0, 0, 0); font-family: '.SFNSDisplay-Regular', '.PingFang-TC-Regular', 'PingFang TC', Helvetica, Verdana, 新細明體, PMingLiU, sans-serif; letter-spacing: 1.50781px; line-height: 22.6172px;">本身已經很久都沒運動了，也沒穿高跟鞋的習慣，若是肌肉是不是早就該萎縮了?</span></p>