身体は精神と共に発達しなければならない。

The body must be developed along with the mind.

身体(しんたい)は精神(せいしん)と共(とも)に発達(はったつ)しなければならない。

Shintai wa seishin totomoni hattatsushinakerebanaranai.

体 (からだ、しんたい、しんだい、しんてい)

body; torso; trunk; build; physique; constitution; health; corpse; dead body

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

精神 (せいしん)

mind; soul; heart; spirit; intention

と共に (とともに)

together with; as X, then Y (e.g. as we age we gain wisdom, as wine matures it becomes more valuable, etc.)

発達 (はったつ)

development; growth

Readings: シン、み

Meanings: somebody, person, one's station in life

Readings: タイ、テイ、からだ、かたち

Meanings: body, substance, object, reality, counter for images

Readings: セイ、ショウ、シヤウ

Meanings: refined, ghost, fairy, energy, vitality, semen, excellence, purity, skill

Readings: シン、ジン、かみ、かん-、こう-

Meanings: gods, mind, soul

Readings: キョウ、とも、とも.に、 -ども

Meanings: together, both, neither, all, and, alike, with

Readings: ハツ、ホツ、た.つ、あば.く、おこ.る、つか.わす、はな.つ

Meanings: departure, discharge, publish, emit, start from, disclose, counter for gunshots

Readings: タツ、ダ、 -たち

Meanings: accomplished, reach, arrive, attain