You can achieve the hardness of fists and calves through a lot of repeated exercises.

To improve the hardness of fists, you can do 2 1 push-ups with fists clenched every day, three times a day, in a group. At the same time, if conditions permit, you can buy a sandbag and practice boxing through it, which is also very good.

For the calf, you need to keep running every day. You can run 3-5 kilometers a day at first. After three months, you can increase the number of kilometers to achieve it. These are all good and practical methods.