Then before you can talk yourself out of it, grab your keys and get out of the house. Don't think, just put yourself in motion. Walk on the treadmill for five minutes. Once your blood starts circulating, it's amazing how good you feel. You might even find that you'll want to go 10 minutes on the treadmill.
Many people walk into a gym and get so frustrated trying to figure out where to start.
There are too many choices and with that sometimes people are overwhelmed and give up. You DO NOT have to workout for a whole hour. After you have finished the treadmill, allow yourself to workout any body part you desire. There are no set rules. If you want to do one set of biceps training, the sets of chest and one-half set of shoulders, go for it.