Gerund as a subject is always singular

For variety in sentence structures, we can begin a sentence with an -ing word or gerund. The following are some examples of having gerunds serving the the subjects.

1 Jogging 10 kilometres every morning is his routine.
2 Waking up at six has been my habit since I was in Primary School.
3 Chatting with friends through my mobile phone is what I do when I am waiting for a bus.
4 Planning what to write is what a blogger has to do daily.

Notice that each subject in the above sentences takes a singular verb.