I’ve been weightlifting for years. Most articles in the fitness magazines are wildly inconsistent. In part, this is because people who lift weights have different goals which cannot be summarized into a single workout plan. Weightlifters also have different genes, level of skills and (since one cannot gain optimal strength and endurance at the same time) different hopes for the balance of strength and endurance they want.
Fitness trainers, from my experience, have a poor grasp of physiology and never know more than what is published in the fitness magazines. They tend to be mesomorphic in body type naturally and make suggestions based on what works for them. It may not work for you, you sound more ectomorphic.
Having looked at the available books, the best book in my opinion is Ken Sprague’s Strength Training For Athletes. It’s old, with lots of amusing 70s pictures. But it addresses all of the issues above. You could probably pick up a paperback copy for a dollar or two in a used book store if it’s not still in print.
In short, it shows how to build strength for beginners, intermediate and advanced lifters. It lists exercises useful for many specific sports and muscle groups. It gives advanced strength and endurance routines if desired. The advice makes sense – medically and practically, and it works, for me and for my training partners over the years. Also helpfullly, it includes free-weight, universal and nautilus exercises and routines.
In short, for a beginner it recommends 3 sets of 8-12, and your husband is right. It recommends 10-15 reps for some leg exercises. You should work the bigger muscle groups first. As you gain experience, you can increase to 5 sets of 8-12. When you can handle this, decrease the number of reps and increase the weight; e.g. sets of 4-6 reps at 50/70/80/90/100 percent of your maximum. Eventually, you can do super-sets using the principle of pre-exhaustion and pyramiding; at this point these techniques would not help you much.
For the hamstrings, start off with good warm-up stretching including using the left hand to touch the right toe, than alternating sides. Don’t want to hurt anything! Also touch your toes several times while crossing your legs at a level below your knees by placing one foot slightly in front of the other.
The following routine would be useful:
Leg Curls: Primarily hamstring and secondary calf/buttock. Sounds like you’re doing these, but do three sets or more.
Deadlifts: stand up to a heavy barbell with your shins against the handle with your feet shoulder width apart and toes forward and slightly outward. Bend down, grasp the handle with an overhand grip and bend your legs until your hips are below your shoulders and slightly below your knees. Keep your head upright and look straight ahead throughout this exercise which works the front thighs and erector spinae with a secondary hamstring emphasis.
Squats and Partial Squats: secondary emphasis on the hamstrings.
Leg Press: quadriceps and gluteals, secondary hamstrings
Hyperextensions: a bench where you keep your legs supported, bend you torso and head down towars the floor, and raise your torso and head against gravity.
Good Mornings: put a LIGHT barbell behind your neck and across the shoulders and bend forward so your torso is lower than an imaginary line drawn from your hips parallel to the floor.
Stiff Legged Deadlifts
Nautilius Hip and Back MAchine