力をつける

You’ll mostly use this with the particle を (o) because you are actively doing the building. You can use it for physical things, like eating a big steak to get your energy back. You can also use it for mental things, like studying hard to improve your math skills. It’s a versatile tool for your vocabulary kit. Just remember: you are the one putting in the effort to 'attach' that power.

Use it when you’re talking about your goals. If you tell a friend, "I want to build my English skills," this is your phrase. It’s also perfect for encouragement. If a friend is feeling weak or tired, you might suggest they eat something nutritious to 力をつける. In a business setting, it’s great for talking about developing professional expertise or a company's market influence. It’s a high-utility phrase for any 'level-up' moment.

Don't use this for mechanical power. If you’re turning on a light or a computer, that’s a different kind of 'power' (dengen). Also, avoid using it for sudden, temporary bursts of energy. This phrase implies a process of building or gaining something that stays with you. If you just mean 'try hard' for one second, use ganbaru instead. And don't confuse it with chikara o kasu, which means to lend a hand to someone else!

In Japan, there is a huge emphasis on 'jitsuryoku' or 'actual ability.' People value the process of slow, steady improvement. The idea of 'attaching' strength suggests that ability isn't always innate; it’s something you acquire through discipline. There’s also a big 'stamina' culture in Japan. You’ll often see 'stamina' foods like eel (unagi) or garlic-heavy dishes marketed as ways to 力をつける during the hot summer months.

You will often hear the passive version: 力がつく (chikara ga tsuku). This means 'strength is gained' or 'skills have improved.' Use this when you notice the results of your hard work. For example, "I’ve been studying, and I feel like my Japanese skills are finally sticking!" Another variation is 実力をつける (jitsuryoku o tsukeru), which specifically means building 'real' or 'actual' ability, often used in professional or academic contexts.