Running in the morning is a good way to keep healthy.

work

exist

this

(early) morning

be

a

okay

way

arrive

keep

Healthy.

work

Do gerund here,

Make a theme.

Run is the prototype of verbs,

Generally used as a predicate.

For example:

male

run

each

good morning

which

be

a

okay

way

arrive

keep

Healthy.