思い切り can mean “with all one's strength,” “with all one's heart,” “to the limits of your heart,” or “to the end of your heart/emotions.”

The character breakdown:
思い (omoi) thought; mind; heart; feelings; emotion; sentiment; love; affection; desire; wish; hope; expectation; imagination; experience
切り (kiri) bounds; limits.

Note: Because this selection contains some special Japanese Hiragana characters, it should be written by a Japanese calligrapher.

精神力量 is a title that speaks of one's soul or spirit and the capacity or strength that soul possesses.

The first two characters mean mind, heart, spirit, and/or soul.

The last two characters mean strength, capacity, or ability.

Note: Separately, these are two words in Japanese and can be pronounced, but this does not make a natural title in Japanese (best if your audience is Chinese).

力 is the simplest form of “power” or “strength.”

In Japanese, it is pronounced “chikara” when used alone, and “ryoku” when used in a sentence (there are also a few other possible pronunciations of this Kanji in Japanese).

In some contexts, this can mean ability, force, physical strength, capability, and influence.

See Also:   Vitality | Strong / Healthy

剛毅 is a Japanese and Chinese word that means resolute and firm, fortitude, firmness of character, hardihood, manliness, or macho.

See Also:  Perseverance | Tenacious / Tenacity

強壯 is an adjective that means powerful or strong.

It can also be translated as able-bodied, robust, or sturdy.
This version of strength also suggests muscularity.

Note that the second character was simplified in Japan after WWII (also simplified in mainland China but not for calligraphy). If you want the modern Japanese/simplified version, please click on the Kanji shown to the right.

See Also:   Vitality | Strong / Healthy

不屈 is the short form of a longer Chinese word and also a word used in Korean and Japanese to express the idea of being indomitable. It literally means “will not bend,” “will not crouch,” “will not yield,” “will not flinch,” or “will not submit.”

Note: Some will translate this as “indomitable spirit”; however, technically, there is no character to suggest the idea of “spirit” in this word.

See Also:  Tenacious / Tenacity | Perseverance / Indomitable / Invincible Fortitude | Carry On | Undaunted

不屈不撓 means “Indomitable” or “Unyielding.”

不屈不撓 is a long word by Chinese standards. At least, it is often translated as a single word into English. It's actually a proverb in Chinese.

If you want to break it down, you can see that the first and third characters are the same. Both mean “not” (they work as a suffix to make a negative or opposite meaning to whatever character follows).

The second character means “bendable.”

The last means “scratched” or “bothered.”

So this really means “Won't be bent, can't be bothered.” I have also seen it written as “Will not crouch, will not submit.” This comes from the fact that the second character can mean “to crouch” and the last can mean “to submit” (as in “to give in” such as “submitting to the rule of someone else”). This may explain better why these four characters mean “indomitable.”

Notes:
Some will translate this as “indomitable spirit”; however, technically, there is no character to suggest the idea of “spirit” in this word.
Other translations include indefatigability, indomitableness, or unremitting tenacity.

The first two characters can be stand-alone words in Chinese.
In Japanese, this is considered two words (with very similar meanings). It's more common to see the word order flipped to 不撓不屈 in Japanese.
The same characters are used in old Korean Hanja. Just like in Japanese, the words are swapped to 不撓不屈 creating a word pronounced “불요불굴” in Korean.

See 不撓不屈

See Also:  Tenacious / Tenacity | Perseverance / Indomitable / Invincible Fortitude | Carry On | Undaunted

If you are into healthy living, 健康生活 might be an excellent selection for a wall scroll to hang in your home.

The first two characters speak of health, vitality, vigor, and being of sound body. The second two characters mean living or life (daily existence).

See Also:   Vitality | Strong / Healthy

毅 is the simplest way to express perseverance in Chinese and Korean Hanja.
This single-character version leaves a bit of mystery about what kind of perseverance you might want to convey.

In Korean, this is usually associated with “strength of character.”

In Japanese, this character can be pronounced in a dozen different ways (so we have left out the Japanese pronunciation guide that normally appears above). In Japanese, this Kanji would usually be translated as “strong” (perhaps strong-willed).

See Also:  Tenacious / Tenacity | Perseverance / Indomitable / Invincible Fortitude | Carry On | Undaunted

百折不撓 is a Chinese proverb that means “Be undaunted in the face of repeated setbacks.”

More directly translated, it reads, “[Overcome] a hundred setbacks, without flinching.” 百折不撓 is of Chinese origin but is commonly used in Japanese and somewhat in Korean (same characters, different pronunciation).

This proverb comes from a long, and occasionally tragic story of a man that lived sometime around 25-220 AD. His name was Qiao Xuan, and he never stooped to flattery but remained an upright person at all times. He fought to expose the corruption of higher-level government officials at great risk to himself.

Then when he was at a higher level in the Imperial Court, bandits were regularly capturing hostages and demanding ransoms. But when his own son was captured, he was so focused on his duty to the Emperor and the common good that he sent a platoon of soldiers to raid the bandits' hideout, and stop them once and for all even at the risk of his own son's life. While all of the bandits were arrested in the raid, they killed Qiao Xuan's son at first sight of the raiding soldiers.

Near the end of his career, a new Emperor came to power, and Qiao Xuan reported to him that one of his ministers was bullying the people and extorting money from them. The new Emperor refused to listen to Qiao Xuan and even promoted the corrupt Minister. Qiao Xuan was so disgusted that in protest, he resigned from his post as minister (something almost never done) and left for his home village.

His tombstone reads “Bai Zhe Bu Nao” which is now a proverb used in Chinese culture to describe a person of strong will who puts up stubborn resistance against great odds.

My Chinese-English dictionary defines these 4 characters as “keep on fighting despite all setbacks,” “be undaunted by repeated setbacks,” and “be indomitable.”

Our translator says it can mean “never give up” in modern Chinese.

Although the first two characters are translated correctly as “repeated setbacks,” the literal meaning is “100 setbacks” or “a rope that breaks 100 times.” The last two characters can mean “do not yield” or “do not give up.”
Most Chinese, Japanese, and Korean people will not take this absolutely literal meaning but will instead understand it as the title suggests above. If you want a single big word definition, it would be indefatigability, indomitableness, persistence, or unyielding.

See Also:  Tenacious / Tenacity | Perseverance / Indomitable / Invincible Fortitude | Perseverance | Persistence