Begovic is hoping his increasing stature will help him meet the high physical demands of top-level football.
He told The Sentinel: "I've just turned 26 so I'm still trying to get a little stronger to help cope with the rigours of the Premier League.
"You play week in, week out. We have 38-plus high intensity games this season and it's important you stay fit and strong if you want your performances to be consistent."
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