Here's the routine Letho of Gulet used to get his rockin' summer bod, that doctors dont want YOU to know.
>Trial of the Long Grasses x 3
>Lose Witcher School x 1
>Forktail Wrestling x F
>Deal with Nilfgaard x 1 (to failure)
>Northern King Lunges x 2
>Nekker Nabs x Endraga
>Bro outs with based White Wolf x 5
>Wild Hunts of Wild Hunt x 1
>Accept offer to stay at Kaer Morhen x 1
Cycle Swallow, Thunderbolt, and a bit of Werewolf Concoction if you really wanna cut effectively.
Good luck nordling