Biopunk is considered a subgenre of Cyberpunk, with more of a focus on biotechnology than the focus on information technology that Cyberpunk focuses on. Biopunk stories tend to focus more on genetic engineering, biohacking, bio-tech mega-corporations, and oppressive government agencies focused on manipulating human DNA.
Biopunk typically utilizes the written word, but there are physical examples that exist, especially in movies (Super Mario Brothers movie, Pokemon: The First Movie, Repo Men, Gattaca, and even the Cyberpunk classic Blade Runner) anime (Akira, Elfen Lied, Neon Genesis Evangelion, even the Haruhi Suzumiya series' hint at this thanks to the character of Mikuru Asahina) video games (Bioshock, Parasite Eve, Panzer Dragoon, Prototype, and Resident Evil) and haunted houses (Silo X).
Grinders are people who apply the hacker ethic to improve their own bodies with do it yourself cybernetic devices or introducing Biochemicals into the body to enhance or change their bodies' functionality. Many grinders identify with the biopunk movement, open-source transhumanism, and techno-progressivism.