Youth must have power and strength. The focus should be on getting both Śakti (शक्ति) and Bala (बल)! Śakti (physical strength and outward skills) and Bala (spiritual strength, mental strength, purity, ethics, self-control) are different. You cannot gain that in modern gyms. You must enroll in Ākhāḍā (आखाड़ा) or sports ground! Bala meant something of the Sūkṣma Śarīra (सूक्ष्म शरीर) ; not merely of the gross body or Sthūla Śarīra (स्थूल शरीर).