I can't remember if I've already posted this but if you are unsure about which spelling of practice to use, practice or practise then replace the words in your sentence with "advice" and "advise". Then one that makes the more sense contains the c or s and tells you which spelling of practice or practise to use.
I.E. If I said "the best way to improve is through continual "practise or practice"? swap those out with advice or advise:
The best way to improve is through continual advise
The best way to improve is through continual advice
The second one makes more sense therefore you should use the "c" spelling of practice, hence:
The best way to improve is through continual practice
Being a good Bristolian, it's the law that 'er' when added to the end of anything, makes that thing bigger. I have this debate with my wife constantly. She says there is no such word as worser !!! Oh wifey, how much wronger can you be ??