This is a good posting because it brings some very important issues to light.
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Making efficient use of your time in the gym can be crucial, because there will come a time when you can't allow an hour for workouts. That often results in quitting or putting off workouts.
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Many of my friends don't workout now, because they think they have to put out a couple hours of hard work to keep fit. It's what they've conditioned themselves to think.
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When I go into the gym to workout...I WORK. I mean I'm breathing hard after every single set, and I sweat through the whole workout. You may even hear me grunt occassionally.
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I finish a good hard workout 2 x 10 reps in 35-45 minutes max and I'm doing 10 to 12 compound exercises using HST training. I work out weights 3 days with aerobics for 1 hour on a treadmill the off weight days. I rest on Sunday.
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First I never allow more than 3 minutes between sets and the next exercise. I usually allow 1 minute, unless I very winded.
The time between exercises is very important, because you really get best benefits for your body inside of 3 minutes. I actually time myself with my watch. I keep busy during that small recovery period by walking around the gym or stretching. I understand stretching is a great practice for enhancing muscle growth as well. It's a great feeling to stretch and pull out some of that pump.
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BIG NO NO...NEVER SIT and linger between exercises or sets. Keep your body moving, stretching,etc. I realize if you are socializing that can take away alot of your time. I just say to other BB.."If you want to talk...you gotta walk with me, because I've only got 45 minutes". Some will walk with you and drop off to something they want to do after a while.
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I do workout mostly with dumbbells and they're already set at my gym. In other words I'm not stacking and restacking a bunch of plate weights all the time. I use a couple of machines...The Nautilus Gravitron and Nautilus abs machine.
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I never wait on other lifters if at all possible. In other words the sequence is unspecific. I do start with squats and SLDL to get the hard work out of the way. If someone has the weights or machine tied up I need I move onto something else. If I can't get to the ab machines...I do my calves. If I can't get to 40# db I do something else.
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I use dumbbells for most exercises including large muscle exercises. I don't have to do shrugs, because of my use of heavy dumbbells. You get a good shrug workout without really trying.
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My goal is in and out 45 minutes in the 15s, and 35 minutes in and out in the 10s and 5s. I don't shower or hang around the gym. I don't give advise. I do cordially say hello to everyone as a rule, but I make a real effort to not get into any conversations that take time. If someone persists for advice I suggest that I'm not qualified to help them, but there are personal trainers available all the time. Those PT will be glad to help them, that's their job.
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I can laugh about this...free advice is never heeded, paid for advice is rarely heeded for long. So, I'll share on the forums when I've got some time, but in the gym it's a big NO NO.