Works the back, biceps and core. Grab a fixed bar (a barbell inside a squat rack or Smith machine works well) and pull yourself up bringing the top of your chest to the bar. Keep your body in a straight line using your core.
Backward lunge to shoulder press
Works the gluteus, quadriceps and shoulders. Using a barbell on your back, take a step backward into a lunge. As you return to standing bring the barbell to the front of your shoulders press it straight overhead.
Squat to deadlift
Works the quadriceps and hamstrings. With the barbell resting comfortably on your upper back, sit back and go into a squat. Press the weight up through your heels. Do a stiff-legged deadlift with the barbell starting in front of your thighs letting your arm hang loose like anchors. Bend forward, keep your back straight, lowering the weight as low as you can without rounding your back. Return to standing using your hamstring and lower back muscles under control.
Plank to tricep extension
Works the core and triceps. Get into the plank position and row a single dumbbell up. From there use your triceps to do a kickback.
Three positions (shoulder width apart, wider and narrow): Works the pectorals, triceps, shoulders, core. Set the Smith bar at a height that is an appropriate challenge. The lower the bar is, the harder the pushup is. The two other positions are not shown, but the variations work different areas of the pectorals and triceps.
When you are pressed on time and want to get muscles to show off, include exercises that work more than one muscle at a time.