Ride more. The more you do the hills the better you'll get at climbing them. I spent the winter doing pretty much no riding apart from my flat commute, just moved house and now have a longer commute (30 miles with somewhere around 1000ft of climbing). The first time I did it I felt pretty drained, but after a few weeks and a lot of food I don't find it an issue to cycle to work, and with the weather picking up I actually look forward to it!
Ride more. The more you do the hills the better you'll get at climbing them. I spent the winter doing pretty much no riding apart from my flat commute, just moved house and now have a longer commute (30 miles with somewhere around 1000ft of climbing). The first time I did it I felt pretty drained, but after a few weeks and a lot of food I don't find it an issue to cycle to work, and with the weather picking up I actually look forward to it!