Erik punched the tree in front of him with all his might, his knuckles were slightly bleeding but he had a smile on his face, the smile of a psychopath, every time he punched his fist bled more and more and the grin on his face deepened.
A month has passed since Sato was Reincarnated into the body of Erik, The entirety of the month was filled with him training his body to its limits, He did pushups, Ran, Did sit-ups, punched and kicked trees to strengthen his legs and fists.
His body has changed a lot over the past month, he was not as scrawny as he used to be, hunting and eating fishes using his spear, eating crabs, eating fruits in the forests and training caused his body to start getting stronger and bigger, His weight had increased by a lot and most of it was pure muscle. Although a 10 year old body doesn't produce much testosterone, his muscles have developed at a fast rate, causing his strength and speed to increase by a lot, his use of the make shift spear also caused him to develop fluidity when using said spear.
His ability of Fast metabolism helped him a lot as it allowed his body to heal faster causing faster growth. His pushup limit extended to hundred and his sit-up limits extended to over 300 in the span of just one month. No wonder people are so strong in this world, even the skeleton like Erik managed to turn into a muscular and strong pre-peubescent over the past month.
Erik started to seriously bleed from his knuckles when he punched the tree harder and faster. The grin on his face turned into a frown as he sighed and started kicking the tree with his bare feet. His Grin started forming once more as his legs started bleeding. He didn't know why this happened but it seemed to happen everytime he started getting hurt or pained.
Eveytime he was in pain, his eyes widened and a smile formed on his face, he only seems to notice it sometimes when training.
Once his knuckles and shins started bleeding profusely, he went to his camp and unwrapped a few salted fishes that were wrapped in large leaves. He ate a few after cooking them over the camp fire for a short while.
The taste was better than Crabs and they provided him with a lot more nutrition than Crabs and filled him up. Once the food was digested in a few minutes, the bleeding stopped and his shins and knuckles had formed bigger caluses than before. His ability to heal his body after eating food had increased quite a lot, he is able to regenerate small injuries by eating a fairly large amount of food.
He went to the river to clean up the dried up blood.
After cleaning them up he went to the camp again and started doing pushups.
"One... two... three..." Erik counted on as he did many pushups in a row.
"One hundred and one... one hundred and t-two." His body struggled to push forward as he stopped at one Hundred and two.
"Time for round two." Erik said as he started doing pushups again starting at zero.
"One..."