Hey & welcome to GT. Glad you are enjoying the lessons! Billy gave you some great advice & a link to my pinky exercises. Thanks, Billy!
I wanted to address some of your other points.
Originally Posted by: relaxmasterI came across several 'spider' exercises in YouTube that also includes the pinky finger. However, mine seemed to be quite different than the guitarist in Youtube as when I tried to use it for the 4th fret in the exercise on the E strong, or rather on all strings, it seems to be curving inwards. This made it hard for me to apply strength and reach out.[/quote]
Every individual has slightly different finger size & topology. It's a great idea to look for as many resources, options & approaches as possbile. But in the end everyone has to find their own individual solution to some problems.
The overall guiding principle is always to play with the most efficient, smoothest motion possible that helps & does not hinder your ability to play the guitar.
Originally Posted by: relaxmasterAdditionally, my left wrist will be quite tired after about 10 minutes.[/quote]Take a break. Do not force it. It's better to practice a little bit at a time consistently every day. If you can stand 5 minutes a few times a day that's fine. Your strength & dexterity will gradually improve if you are applying consistent repetitious practice. Your hands & mind need time to assimilate & automate new physical processes.
Originally Posted by: relaxmasterIt is not possible doing this exercise if I am seated upright, guitar on right thigh and vertical, which is the correct posture recommended by Guitartricks. However after doing so, I find my wrist bending too much and I am afraid of hurting it in the long run. Much better if my raise the guitar neck up at an angle but isnt this the wrong posture?
Absolutely raise your guitar neck up! That is the prefered way to form a more natural curve in your wrist. It is always a good idea to avoid straining your wrist (more precisesly the joint between your forearm & hand).
[quote=relaxmaster]I know the way to go is always to practice and practice to increase muscle strength and dexterity. Just needed to make sure I am not heading towards a more serious muscular issue later on. Does anyone have this issue, or is this normal?
It's normal. But you can help the learning process along by practicing smarter. Here's a group of tutorial aimed at building strength &dexterity.
Make sure you are properly warmed up & stretched.
https://www.guitartricks.com/tutorial.php?input=1525
Build your pinky strength & dexterity.
https://www.guitartricks.com/tutorial.php?input=1292
Then, use these trill drills to work on finger independence & control.
https://www.guitartricks.com/tutorial.php?input=1829
[quote=relaxmaster] Have attacked a picture of top view.
It's not necessary to keep your lower fingers on each fret with full pressure. Especially on lower frets. It's okay & often beneficial to release finger pressure on the lower frets, just enough to reach higher & make that higher fretted note ring properly. Don't completely lift your finger off the strings. Just release the pressure that was necessary to make the note sound. Maintain a little contact, just let the finger rest on the string without pressing it down. Otherwise it's wasted effort to raise your finger until it's completely off the string, only to have to bring it all the way back when you return to that fret.[br][br]Notice in your picture that your index finger is really far away from the 1st fret. That's going to limit the amount of leverage you can apply to the higher frets.
At first it takes a lot of pressure & strain to do anything with guitar. However after you build some strength & dexterity, you'll find it doesn't take as much pressure & strain. If you keep practicing, slowly & consistently you'll find that you gradually get a little more control over your fingers.
Hope that helps! Please ask more if necessary. Have fun!
Christopher Schlegel
Guitar Tricks InstructorChristopher Schlegel Lesson Directory