Resistance training isn't always about lifting the heaviest possible weights or doing as many different exercises as possible. In fact, resistance training is most effective when it recruits the maximum muscle groups in each exercise. Even if you don't go to a gym, you can still get in a killer workout! Here are the best equipment-less workouts to try.

• Burpees – There are very few exercises that are as effective as burpees. You hit most of your muscle groups at once: your chest, shoulders, and triceps with the push-up; your legs and glutes with the squat; your core and back with the plank position and jumping your feet forward and backward; and your cardiovascular system with the jumping and constant movement. A few sets of burpees will burn like crazy, but the more you do, the fitter you get!
• Mountain Climber Push-Ups – Mountain climbers are another great multi-muscle workout, especially when you throw push-ups into the mix. Instead of being on the floor, however, you need to do the exercise on an incline — with your hands on a bench or raised platform. Intersperse mountain climbers (bringing your knees to your chest) with push-ups to give your body a killer workout.
• Pull-Up Burpees – As if burpees weren't hard enough already! The addition of pull-ups will make this an exercise that hits literally every muscle group. You'll need to perform the burpees beneath a pull-up bar. When you stand back up from the plank position (after the push-up), instead of jumping, you'll simply reach up, grab the bar, and pull yourself up. As you come back down, you transition into a squat that starts the burpee. One heck of an exercise!
• Plank Twists – For serious core strength, you don't need any fancy machines to work out. Instead, work with the plank, an isometric exercise that builds serious abs and back strength. But don't just hold the plank position — instead, add a twist into the mix to hit your sides (oblique muscles) as well. Hold the plank for five seconds, then reach your right arm up, under your left side, and back up. Repeat on both sides, and see if you can make it to 60 seconds of plank twists.
• Jump Lunges – These are an amazing lower body workout, one that hits your cardiovascular system at the same time. They're far easier on your joints than basic lunges, as they involve no weight. But don't think they're an easier exercise — if anything, you'll tire more quickly. Basically, you start in the lunge position and jump into the air to switch feet. Do 20 switches (10 per side), and you've got a killer set done!
• Squat Jumps – Yet another awesome exercise that combines cardiovascular training with resistance training. They're just like regular squats, with the addition of a high jump as you come back up. It's an exercise guaranteed to build serious leg strength while improving your cardiovascular conditioning.