Both the infintitive to run and the gerund running are correct after some verbs such as start, begin, hate etc. Some grammarians argue that the infinitive is better or should be used to refer to a single case of something happening and the gerund is to be preferred in other cases. Actual usage does not support this view even though it is true that one or the other of the alternatives may sound better or be more common in some cases.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
rajivmeI started to run ... I started runningThey have the same meaning. Both express something that happened in the past.