@marcd, Thank you for starting this discussion. I found a collection of videos from Mayo Clinic that I think might also be helpful.

Strength training: How-to video collection: https://www.mayoclinic.org/healthy-lifestyle/fitness/in-depth/strength-training/art-20046031

Here is a list of the available videos on the link above:

Body-weight exercises: You can do body-weight exercises with little or no equipment. Watch these strength training videos to see how they’re done.
— Abdominal crunch
— Lunge exercise
— Modified pushup
— Squat exercise
— Step-up exercise

Resistance-tubing exercises: You can do resistance-tubing exercises at home or on the go. These strength training videos will get you started.
— Bent-over row with resistance tubing
— Biceps curl with resistance tubing
— Hamstring curl with resistance tubing
— Hip abduction walk with resistance tubing
— How to choose resistance tubing
— Squat with resistance tubing
— Standing hip abduction with resistance tubing
— Triceps kickback with resistance tubing

Free-weight exercises: Wonder how to get the best results from free weights? These strength training videos will show you how.
— Bent-over row with dumbbell
— Biceps curl with barbell
— Biceps curl with dumbbell
— Calf raise with dumbbell
— Chest press with dumbbell
— Reverse fly with dumbbell
— Squat with dumbbell
— Triceps extension with dumbbell

Weight-machine exercises: Whether you use weight machines at home or at the gym, proper technique is essential. Brush up on the basics with these strength training videos.
— Biceps curl with weight machine
— Chest press with weight machine
— Knee extension with weight machine
— Lat pull-down with weight machine
— Lying hamstring curl with weight machine
— Seated hamstring curl with weight machine
— Seated leg press with weight machine
— Seated row with weight machine
— Triceps extension with weight machine