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Answer:
Doing some light
aerobic work such as walking or cycling is not
going to hinder your muscle gain goals. Doing
too much aerobic work or going too hard during
your aerobic work will, in fact, hinder your
muscle gain.
There are several
reasons for this. In order to gain muscle, you
need to eat more calories than your body burns.
If you do a lot of cardio work, you are burning
a lot of calories that your body could be using
to build muscle.
The other reason
is that hard cardiovascular training can increase
breakdown of the muscle tissue you already have
without providing a reason for your body to
build bigger muscles, as in weight training.
By forcing your body to recover from hard cardio
training, you essentially decrease the available
resources your body has for building muscle.
I would recommend
sticking to 2 days a week of light aerobic work
for about 20 to 30 minutes per session. Use
this is as more of a cardiovascular maintenance
type training rather than really trying to improve
your fitness otherwise you may limit your muscle
gain.
If you want to
really improve your cardio, then you should
focus your training on that. It is always easier
to train towards one goal rather than two goals.
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