Train yourself with your elastic band
Working with the Elastic band is a good alternative when accessing rooms that are closed. You can easily work all the muscle groups that you use in the gym.
I would say that the only limit you will have for this type of bodybuilding is in the weight.
And yes ! Even if with the accumulation of rubber bands you can easily reach more than 80 kg of resistance, beyond that you will hit a glass ceiling.
Here you will find a range of exercises by muscle group: