Pixie Hamstring Training: Building the Back of the Thigh at 80–100 lbs
Pixie Hamstring Training: Building the Back of the Thigh at 80–100 lbs
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At 80 to 100 pounds, the back of your thighs is probably straight — no visible curvature, no separation at the gluteal fold, no definition running down the back of the leg. The hamstrings are the most neglected lower body muscle group in women’s training programs, and at Pixie weight they are often genuinely underdeveloped to the point of producing both aesthetic and functional problems. Aesthetically, underdeveloped hamstrings produce the flat back-of-thigh appearance that makes glutes look lower and less defined than they are. Functionally, hamstring weakness relative to quad strength is one of the most common injury risk factors in physically active women. Both are fixable with deliberate, progressive training.
I am Xavier Savage, a personal trainer based in Houston, Texas and founder of XPL — Xesthetic Performance Labs. I work with clients in-person in Houston and through XPL online programs across the US, Canada, and the UK. Hamstring training for the Pixie archetype is a build-phase priority — not an afterthought, not a finishing exercise, but a primary lower body focus that gets its own dedicated volume within every lower body session.
Phase 1 — Hamstring Anatomy: Three Muscles, Two Functions
The hamstrings are a group of three muscles that run along the posterior — rear — surface of the thigh, from the ischial tuberosity — the sitting bone of the pelvis — to the lower leg bones.
The biceps femoris has two heads — a long head and a short head. The long head originates at the ischial tuberosity and the short head originates at the femur. They merge and insert at the head of the fibula — the outer lower leg bone. The biceps femoris runs along the outer back of the thigh and is the most prominent hamstring muscle visible from behind.
The semitendinosus and semimembranosus run along the inner back of the thigh. The semitendinosus is the more superficial of the two. Both originate at the ischial tuberosity and insert at the tibia — the main lower leg bone — on the inner side.
Together, the three hamstring muscles perform two primary functions. First, knee flexion — bending the knee, bringing the heel toward the buttocks. Second, hip extension — extending the hip by driving it forward from a bent position. The dual function is important for exercise selection: the leg curl trains knee flexion but not hip extension. The Romanian deadlift trains hip extension but not knee flexion. A complete hamstring program trains both functions.
The gluteal fold — the crease where the gluteus maximus meets the hamstrings — is defined by the upper hamstring development just below the glutes. A developed upper hamstring creates a clear, high fold. An underdeveloped hamstring produces the gradual fade from glute to thigh with no clear crease, which makes glutes appear lower and less defined regardless of how developed the glutes themselves are.
Phase 2 — Somatotype Note
Ectomorph hamstrings respond to training, but the long-limbed structure means the muscle bellies sit higher on the thigh, creating a longer tendon and less total visible muscle mass in the lower portion of the thigh. Development produces a lean, elongated hamstring shape rather than the thick, balled hamstring of a short-limbed endomorph. This is appropriate for the Pixie frame — the goal is definition and gluteal fold development, not maximum hamstring mass.
Phase 3 — Body Shape Breakdown
Rectangle
Hamstring development adds curvature to the back of a proportionally straight leg. The visual benefit is significant — it creates the first hint of lower body curves in a frame that naturally lacks them. Hip extension work (Romanian deadlifts) is the priority for the upper hamstring and gluteal fold. Knee flexion work (leg curls) for the mid-thigh separation. Timeline: visible hamstring curvature by week 10 to 14.
Hourglass
Hamstring development completes the lower body curve that the hourglass shape begins. The gluteal fold deepens as upper hamstring development meets the naturally developed glute. Both hip extension and knee flexion work apply. Timeline: visible definition by week 8 to 12.
Pear
The pear carries natural thigh width. Hamstring development here adds posterior definition to the already-present lateral thigh mass. Hip extension work is the priority — it develops the upper hamstring without adding medial or lateral thigh width. Limit leg curl variations that emphasize the outer biceps femoris if adding outer thigh width is not a goal. Timeline: upper hamstring definition and gluteal fold by week 8 to 12.
Phase 4 — The Exact Protocol
Exercise 1: Romanian Deadlift (Dumbbell or Barbell)
Described in detail in the Glute protocol. For hamstring-specific focus, emphasize the eccentric — lower the weight slowly, taking 3 full seconds to reach the bottom stretched position. The stretch on the hamstrings at the bottom is the primary hypertrophic stimulus for this exercise. Do not rush the descent.
Sets and reps: 4 sets of 10 reps. Start at 20 pounds per dumbbell or 45-pound barbell. Add 5 to 10 pounds every two weeks. Rest 90 seconds between sets.
Exercise 2: Lying Leg Curl (Machine)
Lie face down on a leg curl machine. Position the ankle pad just above the heel — not at the mid-calf. Curl both legs toward the buttocks as far as possible. Squeeze the hamstrings at the top — the heels should nearly touch the glutes. Lower slowly — 3 seconds. Do not allow the hips to rise off the bench during the movement, which would indicate the weight is too heavy or hip flexor tightness is limiting range.
Sets and reps: 3 sets of 12 reps. Start at a weight where the last 3 reps are hard. Add weight every two weeks. Rest 60 seconds between sets.
Exercise 3: Nordic Hamstring Curl
Kneel on a padded surface and have someone hold your ankles down, or anchor them under a bar or heavy piece of equipment. Body is upright at the starting position. Lower your torso slowly toward the floor by allowing your knees to extend — your body should fall forward like a controlled descent. Use your hands to catch yourself at the bottom. Push back to the starting position using your hamstrings as much as possible, catching the last portion of the way up with a push from the hands. This is the most intense hamstring exercise available and one of the most effective for injury prevention and development of the knee flexion function of the hamstrings.
Sets and reps: 3 sets of 5 reps to start. This exercise is extremely challenging. Progress by adding reps — aim for 3 sets of 8 reps by week 8 and 3 sets of 12 reps by week 16. Rest 90 seconds between sets.
Exercise 4: Single-Leg Romanian Deadlift
Stand on one leg holding a dumbbell in the opposite hand. Hinge at the hip — push the non-standing leg back behind you as a counterbalance while lowering the dumbbell toward the floor. Keep the standing knee slightly bent. Lower until you feel a significant hamstring stretch. Return to standing by driving the hip forward. This unilateral variation addresses left-right hamstring imbalances and requires significant balance and proprioception — the body’s awareness of its own position in space.
Sets and reps: 3 sets of 10 reps per leg. Start at 15 pounds. Add 5 pounds every two weeks. Rest 60 seconds between legs.
Home Alternative
Nordic hamstring curls can be performed at home with feet anchored under a couch. Dumbbell Romanian deadlifts with any available weight. Slider hamstring curls — lie on your back, place feet on sliders or socks on a smooth floor, and curl your heels toward your hips while lifting your hips off the floor — are an effective alternative to lying leg curls.
Phase 5 — Timeline, Signs, and When to Switch
Week 1: Extreme hamstring soreness after the first Nordic curl session. This is expected. The hamstrings may not have been used eccentrically under load before. Start with 3 sets of 3 reps and build from there.
Week 4: Romanian deadlift strength increasing notably. The gluteal fold beginning to deepen as upper hamstring develops. The back of the thigh is firmer at rest.
Week 12: Visible gluteal fold definition. Hamstring curvature visible from behind when standing. Separation between the inner and outer hamstring visible when the leg is bent.
Signs it is working: progressive weight increases on RDL and leg curl. Gluteal fold visibly deepening in photos. Hamstring strength improving relative to quad strength — functional balance improving.
Signs it is not working: no strength progression after six weeks. Check caloric intake and protein. Also check that you are genuinely reaching hamstring failure — not just leg fatigue — at the end of each set. If the glutes are taking over the RDL, use a lighter weight and focus on the hamstring stretch at the bottom.
Hamstring development works in direct visual partnership with glute development. Review the Pixie Glutes protocol and train both in the same session for maximum lower body development efficiency. When your weight moves above 100 pounds, take the XPL Archetype Quiz for your updated protocol.
I train clients in person in Houston, Texas and work with people across the US, Canada, and the UK online through XPL. Take the XPL Archetype Quiz to get your exact protocol, or visit xperformancelab.com/plans-pricing to work with me directly.
The standards behind the standards. — Xavier Savage, XPL Xesthetic Performance Labs, Houston, TX
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Xavier Savage
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I do not shape muscle. I shape structure. The person you become is the person you construct.
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