to start doing sth with people who have already been doing it
join in
not to complete sth, to finish too early
drop out of
to enter a competition
go in for
to stop doing sth that you've been doing for some time
give up
to become calmer and less excited after an effort
cool down
to prepare for a big effort by doing some exercises
warm up
to try to make people admire you
show off
to sign a document saying that you will be involved in something
sign up for
to participate in an activity
take part in
to start a new hobby
take up
to have right qualities to do something
be cut out for
___________ work or a person
get on with