Shoosh, if you find it difficult to look round, it's easier if you let go of your right hand from the handlebar and look from your right shoulder, you'll find this hugely easier than looking back with both hand on the handlebar.
that if you hasn't already been doing that of course.
The other option is to temporary have a wing mirror on the right side of the handlebar, not as good as looking back, but still a lots better than listening for incoming vehicles.
Also remember that you may not hear cyclist approaching, especially cyclists on fixed wheel bicycles, electric motorcycles, etc.
Shoosh, if you find it difficult to look round, it's easier if you let go of your right hand from the handlebar and look from your right shoulder, you'll find this hugely easier than looking back with both hand on the handlebar.
that if you hasn't already been doing that of course.
The other option is to temporary have a wing mirror on the right side of the handlebar, not as good as looking back, but still a lots better than listening for incoming vehicles.
Also remember that you may not hear cyclist approaching, especially cyclists on fixed wheel bicycles, electric motorcycles, etc.