The RNLI in Cornwall is launching a new campaign to stop people jumping into the sea from cliffs and sea walls. The charity said there has been an increase in the number of "tombstoning" rescues this year.
It said many of the injuries they have had to deal with involved young men and the consequences can be tragic if things go wrong.
Earlier this month an RNLI lifeguard broke his leg taking part in the activity in Newquay.