AR 350-1 Appendix G-9 discusses the issue along with FM 7-22 Chapter 6.
Extracts of AR 350-1 Appendix G-9a
(4) Special conditioning programs are appropriate for Soldiers who have difficulty meeting unit goals or Army standards. Such programs will not be punitive; they must be designed to improve the fitness level of Soldiers.Additional training sessions are not always a substitute for smart, tailored conditioning sessions and can lead to over training. Special conditioning programs will be designed to meet individual needs to overcome identified weaknesses(for example, aerobic or strength deficiency). In addition, they should encourage a healthy lifestyle.