After seeing pictures of himself looking “too thin” during the last series of BBC drama, Robin Hood, hunky Jonas Armstrong went training and increased his muscle mass!

Jonas, 26,told The Sun: “I saw a picture of myself last year and I looked a bit thin. So I made a decision to get a personal trainer. And I’ve put on 21lbs in muscle.

“I now train four times a week and I feel a lot fitter. The stunt guys have been telling me ‘You look much more confident in your body’.”

Robin Hood returns to BBC One This Saturday!