One of the best ways to warm-up before you start playing is by playing guitar scales. It gives you an opportunity to concentrate on your guitar technique without thinking about a song or chords.
Here is a video showing you how 2 ways to play a C-Scale. It has a one and two octave version of the scale. There are many types of guitar scales. There are blues scales, jazz scales and scales built on major and minor keys.
These are the first guitar scales I learned. It’s a great place to start. And if you’ve been playing for years, it’s still helpful to warm-up with scales like these.
Regardless of the type of music you play, playing scales can be an excellent vehicle to improve your technique. Great musicians of very instrument, including the voice, have honed their skills by working on scales.
Hope you enjoy the video and apply what you learn.
The music for two C scales is here. c-scale.pdf