There is only one dumbbell. Let me talk about several schemes first! The first one, I think, is the best, but I don't think you will adopt it-you sell the dumbbells and use the money to find a cheap gym or buy two cheap dumbbells. The second is that you must insist on using only one dumbbell, so you have to do several movements. You can do bench press: hold the dumbbell with both hands, the dumbbell is vertical, you hold the one above the dumbbell, and be careful not to loosen it. Then put it down and push it up. There is nothing to say. Thirdly, if you can bear a few strong ropes besides dumbbells, there will be some other movements. For example, tie the rope to a dumbbell, bypass a branch about as high as your shoulder, or it is best to have a stable shelf (preferably a pulley) where the rope will not slip, so you can think of it as a one-sided bird. If there are enough ropes and pulleys, you can separate the two ropes and put them on a wide shelf to make a bird. Fourth, there are dumbbells and ropes, but there are no shelves, so I don't want to hurt trees. Then tie the dumbbell to your back, tie it tightly and do push-ups. Fifth, if there happens to be parallel bars-others' or school's can do it. You can buy anything except dumbbells, just buy one. You can flex your arm, then hold the dumbbell with your feet and flex your arm with weight, which is very effective. Go on, I haven't figured it out either, but I think there must be a way. Try as much as possible!