Update on this matter: My work out is going great and I FEEL GREAT. Best decision of my life! At the moment I'm up in five days of work out a week of either gym, jogging (or both) or swimming.
Results are visible and my stamina is improving fast, but what amazes me the most is the result on my knee (1 year post ACL reconstructive surgery), I can actually RUN, accelerate and sprint. I think I haven't been this fast since I damaged my knee... still not as fast as before the accident, obviously it's not like a healthy knee, but I have good hopes now that it can become so. In five years running hasn't been this good =)))