The 30 year-old weighed a mammoth 176 pounds at the 30-day check, right on the 10% limit, and has been working scientifically to hit targets for the September 10 bout against Gennady Golovkin.
Brook is moving up two divisions to challenge middleweight king Golovkin for his clutch of championships, although came in almost a stone heavier at their first stipulated weigh-in last month.
Golovkin, 34, was at a comfortable 165 pounds and right now should be around 163 or lower as the Kazakh puncher nears one of his biggest nights since turning pro.
The fight, involving two undefeated champions with records combining to 71-0, airs live on UK pay-per-view from the O2 Arena in London, whilst HBO will televise on US soil.
The match-up is joined by Roman Gonzalez’s bid to become four-weight world title holder against Carlos Cuadras and boasts two more world championships on the undercard.
