I maintain by going to spin four or five days a week. I love that I can get a solid butt-kicking in 40 minutes. I also strength train two or three times a week.
At some point you can't lift this boulder with just your own strength. And if you find that you need to move bigger and bigger boulders up hills you will need more and more help.
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I'll do strength training in my dressing room between shoots and I've been known to make business calls while out jogging. I try to mute myself on Bluetooth so they can't hear me huffing and puffing but I usually end up getting caught.