Tummy time

Hey ladies. My son is 5 months old and i am still doing tummy time frequently every day with him but ill be honest. Hes lazy. He used to hate tummy time and have motivation to get off of his tummy but now hes perfectly content just laying on his tummy and not even lifting his head. He can roll from tummy to back. He hasnt mastered it and it takes a lot of effort for him but he can do it. He just has no motivation to do it. Ive tried placing toys out of reach, above him, ive sat with him and encourage him and hold toys out for him but he just lifts his arm and reaches and then gives up. Ive seen him attempt crawling position with some success. Like i know hes strong enough and can do it all he just chooses not to? Hes even sitting independently as well but just doesnt participate in tummy time. Any ideas how i can get him engaged with it again?