The following regimen is more intense than the previous splits I posted and is better suited for individuals who have some experience with weight training who want to intensify their current training level. This is designed to build more mass in the lower body for greater strength and power, and is also great for toning up the lower body in general. Use caution if you have any low back or knee issues and avoid any exercises which cause you pain in these regions.

Upper/Lower Four Day Split Variation #3:
NOTE: This variation works the quads and abdominals twice in a week. Rest 30 to 45 seconds between sets.

Monday – Quads, Hamstrings, Calves, Abs:

Leg extensions – 3 sets of 12 repetitions
Leg presses (feet shoulder width apart) – 3 sets of 12 repetitions
Bosu ball squats holding onto plate/weight – 4 sets of 12 repetitions
Smith Machine squats – 4 sets of 12 repetitions
Seated calf raises – 3 sets of 12 repetitions
Calf raises on leg press machine – 3 sets of 12 repetitions
Prone leg curls – 3 sets of 12 repetitions
Seated leg curls – 3 sets of 10 repetitions
Stability ball crunches – 3 sets of 25 repetitions
Reverse crunches – 3 sets of 12 repetitions

Tuesday – Chest, Shoulders, Triceps:

Seated chest press machine – 3 sets of 15 repetitions
Incline dumbbbell chest presses – 3 sets of 12 repetitions
Flat bench dumbbell chest flyes – 3 sets of 12 repetitions
Seated military shoulder presses – 3 sets of 12 repetitions
Dumbbell front raises – 3 sets of 12 repetitions
Dumbbell one arm side lateral raises – 3 sets of 10 repetitions
Cable tricep pushdowns – 3 sets of 12 repetitions
Seated dip machine – 3 sets of 10 repetitions

Wednesday – OFF

Thursday – Back, Biceps, Abs:

Wide grip lat pulldowns – 3 sets of 12 repetitions
Seated close grip cable rows – 3 sets of 12 repetitions
Bent over obarbell rows – 3 sets of 12 repetitions
Hyperextensions – 3 sets of 15 repetitions
Seated dumbbell arm curls – 3 sets of 12 repetitions
Standing barbell curls – 3 sets of 10 repetitions
One arm dumbbell preacher curls – 3 sets of 15 repetitions
Bicycle crunches – 3 sets of 25 repetitions
Reverse crunches – 3 sets of 15 repetitions

Friday – Quads, Glutes:

Leg extensions – 3 sets of 12 repetitions
Leg presses (feet close together) – 3 sets of 12 repetitions
Plie squats holding onto plate/weight – 4 sets of 12 repetitions (please see my Glute Series Post: http://wp.me/p1TAxT-al)
Smith Machine squats – 4 sets of 12 repetitions
Good Mornings – 3 sets of 12 repetitions (please see my Glute Series Post: http://wp.me/p1TAxT-fP)
One legged leg presses – 3 sets of 15 repetitions (please see my Glute Series Post: http://wp.me/p1TAxT-ad)
Walking diagonal lunges – 3 sets of 15 repetitions (please see my Glute Series Post: http://wp.me/p1TAxT-kV)
Bench step ups – 3 sets of 12 repetitions (please see my Glut Series Post: http://wp.me/p1TAxT-59)

Saturday – OFF

Sunday – OFF