The meaning of this phrasal verb is
BECOMING AN ADULT
GROW UP
WHEN YOU REMEMBER THE PAST
LOOK BACK
WHEN YOU TAKE CARE OF SOMEONE
LOOK AFTER
TO LOOK LIKE SOMEONE... IN APPEARANCE OR HABIT
TAKE AFTER
TO SEARCH A WRITTEN INFORMATION, IN A BOOK, DICITIONARY, IN A MAGAZINE, IN A DIARY ETC...
LOOK UP
TO PREPARE FOR A SPORT OR ACTIVITY BY DOING GENTLE EXERCISES 
WARM UP
TO BECOME BETTER AFTER BEING ILL, RECOVER FROM BEING SICK.![]()
GET OVER
TO USE UP ENERGY OR GET RID OF FAT FROM YOUR BODY BY DOING SOME EXERCISES
BURN OFF
TO GET FATTER OR HEAVIER
PUT ON (WEIGHT)
TO EXERCISE... RUNNING, GOING TO THE GYM, SWIMMING ETC.. 
WORK OUT
TO START DOING ND ACTIVITY, HOBBY OR JOB.
TAKE UP
TO INCREASE OR BECOME STRONGER
BUILD UP
TO EXTEND YOUR BODY AND MUSCLES...
STRETCH OUT
STOP SLEEPING OR MAKE SOMEONE STOP SLEEPING
WAKE UP
THE CONTRARY OF SITTING DOWN