Excess cardio/sparing muscle tissue?

I work as a teacher during the day...run my own landscape business afternoon and night.
With all the walking I do due to mowing (anywhere from 1-4 hrs total) is it unwise to do much more cardio? I am 6'1", 243 (down from 265) and much of the cardio has been through my mowing.
Add more cardio? (been doing a couple mornings per week for 45min)
I can provide more info if needed. I'm just not sure if I'll be OVERdoing this fat burning and tapping into muscle, even at my size.
Been keeping cals between 2000-2500, protein aprox 300g.
Thanks bros.
-HB

I mentioned in another recent post that I'm only lifting twice per week, whole body to maintain muscle.

unless you keep your heart rate between 65-70% while your mowing, you arent priming your body for fat burning, maybe you should dedicate a separate rountine and do brisk walking for 45 mins. mowing wont cut it out.

Quote:

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Originally Posted by homeboybonanza

I mentioned in another recent post that I'm only lifting twice per week, whole body to maintain muscle.

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Why would twice per week, or the "whole body" at one time, be indicative of one maintaining muscle??

~SC~