Stretch your calves. General strength training would also help. Tip: Don't relax though, try to hold the position with active muscles and somewhat straight back

Stretch your calves. General strength training would also help. Tip: Don't relax though, try to hold the position with active muscles and somewhat straight back. Then you will also get stronger and burn fat/energy while also gaining flexibility! It will help with getting your socks on in the morning and general fitness.