Discussion
The success of a pilot trial does not necessarily require the detection of the significant effectiveness but instead provides sufficient evidence to determine the possibility of proceeding to the main trial.The retention rate in this study was much better than that reported in the results of a systematic review on home‐based exercise programs.The difference in the change in SPPB scores between the two groups was <1.0 point, which is the value that configures an MCID,The reasons for the lack of positive results in these outcomes are unclear. We revised and reported the protocol for the phase III trial to address methodological concerns.The difference in the MCS score between the two groups was >3.0 points that configure an MCID.This phase II trial could not determine whether exercise adherence and effectiveness differed by participant characteristics (e.g., sex, age, frailty severity), owing to the small sample size. Thus, we cannot discuss the generalizability of its feasibility and efficacy; accordingly, the phase III trial will apply subgroup analyses and assess heterogeneity by using a larger sample size.