pass out = faint

put on/gain weight = become heavier

take up = start an activity

work out = exercise in the gym

break down = collapse physically or mentally

a breakdown = noun, the state of collapsing

break out = illness develops and spreads quickly

come round = recover consciousness after fainting

cut down on = reduce the intake of sg.

get over = recover

burn off = use up (calories)

come down with = become ill with

give up = stop doing it

build up your strength = become stronger and healthier