How have you kept up with professional development over the last three years?
This is an ideal opportunity to exhibit that you are a doer. Never give answers like you don’t have time to go for specialized trainings for some reason, but are still good at the job at hand. It shows lack of initiative to keep improving by attending professional training or giving lack of time as an excuse.
You can reveal that you are someone who likes to keep updated to the latest technology and keep on improving your skills. You can also state the trainings you have attended or measures you have taken to improve your skills.