If you only have access to a barbell, try these workouts from MensFitness.com:

Workout I

1 Front Squat
Sets: 5 Reps: 5 Rest: 90 sec.
Start with the barbell on the supports of a power rack at about shoulder height. Grab the bar overhand and raise your elbows until your upper arms are parallel to the floor. Now lift the bar off the rack, letting it roll toward your fingers-this is where it should rest throughout the exercise (as long as you keep your elbows raised, you won’t have trouble balancing the bar) [1]. Squat as low as you can [2], and then drive with your legs to return to the starting position. That’s one rep.

2 Snatch
Sets: 5 Reps: 5 Rest: 90 sec.
Place a barbell on the floor and grab it with an overhand grip, hands twice shoulder-width apart. Keeping your lower back in its natural arch, crouch down behind it as if you were going to perform a deadlift [1]. Now explosively stand up and raise the bar straight up in front of your torso. When the bar reaches chest level, flip your wrists to face the ceiling and allow the momentum to help you press the bar straight overhead [2]. Reverse the motion to return the bar to the floor. That’s one rep.

3 Barbell Shoulder Press
Sets: 5 Reps: 5 Rest: 90 sec.
Stand with your feet shoulder-width apart or slightly narrower and grab the bar with a slightly wider-than-shoulder- width grip (wrap your thumbs around the bar). To get the bar into position, you can either explosively heave it up off the floor and up to your shoulders, or set the bar at shoulder level on the supports of a power rack. If the bar is on the rack, nudge it off and let it rest against the front of your shoulders. Squeeze your shoulder blades together, and push your chest out [1]. Begin pressing the bar overhead, retracting your head as the bar rises to keep it out of the way. When the bar passes your head, press it up and slightly backward so that it ends up in line with the back of your head [2]. Hold for a moment, then lower the bar back to your shoulders. That’s one rep.

Check out the other workout by clicking here.

If you?re a hard gainer, these workouts can be beneficial because they?re all compound movements that incorporate more muscle groups.