Think in terms of specificity of exercise for specific events. If the event is lifting and carrying furniture, then a good exercise would be lifting and carrying furniture or bulky weights. One of the main considerations to this event is to avoid injury so that you won’t miss any time in the gym.
If moving furniture is new to you, practice the squat position in front of a piece of furniture, testing the amount of weight to lift and where to best grab hold, your back and butt position, the lift, your breath, your ab control, the carry, your breath, and the set down. You may need a wider stance than your regular squat to allow you to get in close to bulky furniture. In this case you want to make sure that your hip adductors and hamstrings are flexible. Begin with smaller, lighter furniture like a chair or end table and work your way up gradually, concentrating on your lifting form. You may also consider wearing a lifting belt.
Get help if you can. If you do lift with a friend, work out a count to lift and set down so that you are in sync and avoid an unexpected drop - a frequent cause of injury. Before you start the job, check for any obstacles, steps, doorways to maneuver thru, loose rugs and electrical cords, pets etc., and plan accordingly. Remember that your view is obstructed when carrying bulky items so make sure your path is clear and level. Plan in advance whether you will need to use a utility or furniture dolly or hand truck so that you can work smarter and safer. Good luck.