Russell Martin has admitted he felt embarrassed by Swansea City’s latest collapse and vowed to bring in more athletic and powerful players this summer. The Swans head coach again watched his team succumb in a one-sided second-half as they were thrashed 5-1 at Nottingham Forest. In three of their last four games, the Swans have conceded three second half goals to Reading, three to Bournemouth and now four to Forest.