Question

Rollerblading in the park with his friends was so enjoyable for Aaron that he did not notice the painful sensation in his heels. When he got home and removed his skates, his heels were swollen with blisters. It took a long time to heal, but his feet were eventually able to recover. When he thought back on the day, he realized he hadn’t worn the right kind of socks. For years afterwards, he took extra care to wear good socks and protective padding for his heels.
Which is the main idea of this paragraph?