Hello
Cardio is real important in the off season. Don’t over do it though. It will keep your heart healthy, blood flushed, also aside from the health benefits, cardio will help build the new extreme capillary networks to support all that new found muscle growth. This capillary network will help you hold more muscles when getting in shape.
As far as loosing size from cardio, that hard to understand... the only loss you will experience is total body volume, unless as previously stated you are WAY OVERTRAINING! A brisk walk or swimming should eliminate that. I’ve been swimming lately and fell real good.
Out