A tumbler bin is a cylindrical bin that rotates to speed up the composting process. Turning the tumbler means the organic materials are mixed and infused with fresh oxygen.
These bins aren’t for everyone however, the bin will need to be full to start. Also, once it’s started, nothing else can be added to the mix. Even though they produce compost faster that some other methods, it does involve being able to turn the tumbler yourself, so may not be perfectly suitable for anyone with back or shoulder ailments.
If you don’t feel like a tumbler is suitable for your needs, turning your compost frequently will accelerate the decomposition process, this will ‘fluff’ up your compost heap and create air pockets where oxygen can get inside.