体力

1. Origins, structure, and basic meaning

• Structure: 体力 (たいりょく) is a noun for physical strength and endurance needed to sustain movement or work.
• Basic usage: 十分な体力が必要だ makes endurance a requirement for a long trail, while 落ちた体力を取り戻す makes strength lost through illness the object gradually recovered.

2. Common pitfalls and similar expressions

• Required capacity and recovered strength
  • 体力が必要 is a precondition for activity, whereas 体力を取り戻す is a process of returning toward a former level. The noun is not limited to one burst of muscular force.