I go in hard. I come out soft. You blow me hard. What am I?

Why this works

This riddle plays with the different meanings of the words involved. "I go in hard" refers to gum being hard when it's in its original form, like a stick or a pellet. "I come out soft" describes how, once chewed, the gum becomes soft and pliable. Finally, "you blow me hard" hints at the fun of blowing bubbles with gum, which requires a bit of force. Together, these clues cleverly lead to the answer: gum!