Want a gym-quality workout without having to take off your pajamas? Heed this advice.

The alarm buzzes at 5:30 a.m. You get up, brave the elements and arrive at the gym for your morning workout only to be stuck with the world’s squeakiest elliptical. You go for some dumbbell flyes instead, but the gorilla who just grunted out 5 sets left a pool of sweat on the bench. (Too bad he didn’t leave a snorkel.) After some half-hearted lunges, you shower — fretting over the antibiotic-resistant bacteria rumored to eat your flesh — and wonder why you even bothered.

It’s enough to make a guy retire to a life of Oreo supplements and remote-control curls. If this scenario sounds distressingly familiar, chances are you’re one of many increasingly looking to build a kick-ass home gym.

“You wake up in the morning and it’s right there in your house,” enthuses Michele S. Olson, PhD, FACSM, CSCS, professor of exercise science at Auburn State University. Working out at home beats “trying to go to the gym, organizing your workout bag and accounting for travel time,” she adds.

Whatever the reason — convenience, shyness about a still-developing physique, or just getting away from bad FM radio and long-term contracts — mapping out a domestic workout area for resistance and cardiovascular training is one of the best investments you can make in your long-term health. Here’s your blueprint.

Weighty Matters
We’ve all seen the multistation contraptions that look ready for NASA lift-off clearance. But those universal units, says Chicago-based personal trainer Clint Phillips, “try to do the work of 20 different machines and don’t end up doing any one of them particularly well.”

Instead, scour sales flyers or the classifieds for a new or used weight set — iron, not the plastic-and-sand doorstops — and invest in a good bench with incline/decline capability that’s big enough for your frame. (Bench width and length can vary.) An Olympic-sized bar will have you working your grip, but stay away from rubber-band resistance and other infomercial gimmickry. “You get more stabilizer activation with weights,” says John Stone, a fitness enthusiast and author of a popular Web site charting his progress in an ever-evolving home gym. “You get more constant resistance through the full range of motion.” (The one time you should consider a resistance-band machine, says Olson, is if you’re unable to sequester heavy weights from children.)

Stone swears by a good set of dumbbells, which offer a near-endless variety of exercises, but acknowledges that not everyone has room for a complete set of ascending pairs. If you have the budget, consider adjustable dumbbells, which switch the weight incrementally without taking up space. “I like the Bowflex SelectTech because you just twist them on the ends and they come right up out of the rack,” says Phillips.

Like all equipment, it’s important to try it out and see if it syncs up with your body type. One lifter might swear by a particular brand, another might just swear at it.

Olson sums it up succinctly: “Try before you buy.”

Air Supply
A good set of weights can be had for a reasonable price whether it’s from a big-box store or a neighbor’s yard sale, but one area you’d be advised not to cut corners is in your cardio equipment. The lower-end models tend to crumble under rigorous use, and most people find their unnatural movement and spotty performance a good reason
to put them up for adoption.

Used or new, opt for a higher-end established brand (models manufactured by Precor, NordicTrack and Sole tend to earn high marks from industry watchdogs), and seriously consider making it a treadmill. “Research shows that most people tend to be more comfortable using a treadmill and adhering to using it versus a stationary bike,” reports Olson. “We don’t ride bicycles anymore. We’re not as familiar with those movements.”

Look for treadmills with a “continuous duty” rating of at least 1.5 horsepower (more if you’re going to run on it) and at least 3/4-inch cushioning to spare your joints. (Don’t pay attention to “peak duty” ratings, as the machine’s maximum output is of little consequence.) Make sure it’s one with a belt that’s long and wide enough to fit your stride; a rave review from Consumer Reports means little if it doesn’t conform to your body type.

Your workout environment can have a big effect. While some masochists enjoy grunting away in cold and musty areas, others need visual stimulation.

Safety First
While working out alone may spare you the shame of displaying a work-in-progress bench max, it also presents real danger when no one is around to save your (literal) neck from a failed rep. (And don’t even think about squatting on a rug that can shift underneath your feet.)

Smith machines — stations with vertical bars that allow the barbell to grab on to preset catches — are popular, “but they sometimes lock you into an unnatural range of motion,” says Phillips. “It’s going to move right along those rails, and that’s not always biomechanically sound.”

Dumbbells are more easily controlled, but serious solitary weight?lifters should invest in a power cage, which allows freedom of movement in all dimensions without threat of injury. “A power rack is an excellent piece of equipment, relatively inexpensive and allows you to do quite a lot,” Stone enthuses. “I made a lot of progress using one.”

To further reduce the possibility of accidents, Phillips advises consulting with a personal trainer to secure proper form. “Don’t be afraid to take some notes and write all the exercises down,” he says. “I’ve had people draw little stick figures to remind them, or get cameras out and take pictures of me.”

Mood Awakening
Your workout environment can have a big effect on your adherence to a routine. While some masochists enjoy grunting away in cold and musty areas, others need visual stimulation. Consider some new paint, an area with windows or a quick epoxy coat on a garage floor.

Some people put up photos or posters for motivation. (Stone has shots of icons like Arnold Schwarzenegger and Frank Zane hanging near his torture racks.) “Sometimes if you’re grinding it out and feeling a little tired, it helps to look up at those guys and think about what they must have gone through to get to that level,” he says. “They’ve gotten me through some tough sets.”

Training in your SpongeBob sweats is a plus, but introverted sessions can deprive you of social reinforcement. Try public competitions or joining an online discussion group to share your experiences.

Goal Setting
Working out in your SpongeBob sweats is a plus, but introverted sessions can deprive you of the social reinforcement that allows for greater exertion. Think about committing to a public test of your fitness, says Todd M. Kays, PhD, a sports psychologist. “If you’re training by yourself in a gym, set yourself up for a 5k or a 10k run. You have those external measurements in that you’re forced to perform outside of your home.” Other goals, like body sculpting, can be reinforced by joining online discussion groups and sharing your progress with others.

Above all, don’t wind up a statistic — one of those poor souls who max out a Visa for a half-ton of ill-advised equipment before putting it on Craigslist. Start slowly, and match your purchases to your fitness level.

“To me, it’s a progression,” says Stone. “There are plenty of ways to work out without spending a fortune or taking up an entire room. Don’t feel like you have to have world-class equipment to get good results.

“There’s definitely a lot you can do with a set of dumbbells and a bench.”