I'm sparring on a regular basis with a good heavyweight,technically sound.He's 90kg and I'm 75kg but we're about the same height, I'm 186 cm and he's 189 cm.Now he's going all out on me. But like the first week he was holding back. But I can remember that I was really shocked at the power of his punches. Defensively I'm quite a good fighter but even when I blocked his punches he seemed to move me.