The present invention relates to the novel use of panduratin derivatives or an extract of Boesenbergia pandurata for promoting muscle mass growth, fighting fatigue, and enhancing exercise performance capability. More particularly, the present invention relates to a composition for enhancing exercise performance capability, promoting muscle mass growth, and fighting fatigue, which comprises panduratin derivatives or salts thereof, or an extract of Boesenbergia pandurata, as active ingredients, and which promotes muscle mass growth and recovery from fatigue to improve mobility. The present invention also relates to a method for improving exercise performance capability, promoting muscle mass growth, and fighting fatigue, which involves injecting panduratin derivatives or salts thereof, or an extract of Boesenbergia pandurata, into an individual requiring same.; The panduratin derivatives or the extract of Boesenbergia pandurata of the present invention can be used safely with no adverse effects, and increases the expression of PPAR d in the muscles, thus exhibiting excellent effects in promoting muscle mass growth, recovery from fatigue, and an enhancement in exercise performance capability such as an enhancement in mobility.