Nikki Blackheart posts 4+ hour session

- Trainer and athlete Nikki Blackheart shared an intense training clip featuring 4+ hours of ring work and plyometrics that drew heavy engagement online. (x.com) - The post highlighted sustained skill and conditioning sequencing rather than a single high‑rep circuit. (x.com) - Followers debated programming and recovery after a visibly long, high‑intensity session. (x.com)