Reply to the letter : To consider the exercise density in the dose–response relationship: the idea is promising, the operationalization tricky!

Fabian Herold; Liye Zou; Paula Theobald; Patrick Manser; Ryan S. Falck; Qian Yu; Teresa Liu-Ambrose; Arthur F. Kramer; Kirk I. Erickson; Boris Cheval; Yanxia Chen; Matthew Heath; Zhihao Zhang; Toru Ishihara; Keita Kamijo; Soichi Ando; Joseph T. Costello; Mats Hallgren; David Moreau; Vahid Farrahi; David A. Raichlen; Emmanuel Stamatakis; Michael J. Wheeler; Neville Owen; Sebastian Ludyga; Henning Budde; Thomas Gronwald