Purpose of reviewPatients presenting for surgery are increasingly older and frail. Prehabilitation offers the best hope of preemptive functional optimisation to improve postoperative outcomes. Systematic reviews and metaanalyses show signals of improved function and reduced complications and length of stay, but are hampered by small trials with heterogeneous nature of interventions. Recent findingsThe value proposition for prehabilitation is strengthened by applying the following considerations to the evidence. Multimodal prehabilitation programmes incorporating elements of exercise, nutrition, and psychological preparation have a sound physiological basis and will help standardise care delivery and evidence gathering. Targeting prehabilitation resources at high-risk patients may yield higher returns. Effective prehabilitation programmes must be individualised and pragmatic to address known barriers to adherence. The evidence for functional improvement is clear and this aligns with the values of older patients. A comprehensive analysis of value incorporates functional, quality of life, and cost outcomes in addition to conventional morbidity and mortality measures. SummaryMultimodal prehabilitation delivered by a multidisciplinary team improves functional outcomes following surgery. Function is an integral part of multidimensional value assessment including clinical and experiential measures. Future value enhancements include addressing frailty and overcoming barriers through targeted programme design.