DOing excess cario can inhibit muscle gain and retention. How much is too much? There is no answer for that. Everyone is different.
BUT, intensity of the weight workout and diet will dramatically impact muscle gain/retention. If you lift half ass, you will lose muscle. If your diet is half ass, you will lose muscle.
If you are going to focus on endurance events AND weight train - and try to maximize as much as you can - then you are going to have to be VERY diligent about your protein intake and your weight workouts.
I need your definition and examples of "interval training". Proper HIIT will help lose fat while retaining muscle - but it has to be done CORRECTLY.
BUT, intensity of the weight workout and diet will dramatically impact muscle gain/retention. If you lift half ass, you will lose muscle. If your diet is half ass, you will lose muscle.
If you are going to focus on endurance events AND weight train - and try to maximize as much as you can - then you are going to have to be VERY diligent about your protein intake and your weight workouts.
I need your definition and examples of "interval training". Proper HIIT will help lose fat while retaining muscle - but it has to be done CORRECTLY.