Hamstrings are one of those muscle groups that you always hear
    people complain about. For one reason or another, most serious
    physique athletes and enthusiasts find it almost impossible to
    increase their hamstring size. 
After all, hamstrings often complete a body and add the
    "wow" factor when viewed from behind, especially on stage
    or at the beach. Before you even consider using any of the
    information in this article, I first have to explain what proper
  hamstring training is. 
The hamstrings work in both hip extension and knee flexion, so
    think of a stiff leg deadlift and a seated hamstring curl.
    Hamstring training has taken a black eye in recent times due to all
    the talk of glute dysfunction. In fact, most people have totally
    given up on isolated hamstring training. 
Isolated hamstring training is a must, though.We
    can only rely on compound movements for so long, so we need to make
    sure that we're training our hamstrings in both hip
    extension and knee flexion through various deadlifting
    and squatting variations, as well as isolated hamstring movements
    like glute-ham raises and numerous leg curls.
A surefire way to increase your hamstring size and strength is
    to consider foot position in leg curls. Very little
    attention is paid to the calves during knee flexion training and in
    my opinion that's a mistake. The first thing I do when I
    consult with a physique client with underdeveloped hamstrings is to
  ask them one simple question.
"Which way do your toes point during a leg
  curl?"
I've yet to have one client tell me they pay attention to
    this. We have to consider calf function during knee flexion. The
    gastrocnemius is a two-joint muscle as it crosses both the ankle
    and the knee. Its fiber length doesn't allow it to be active
    during both knee flexion and plantarflexion (pointing the foot away
    from the body). As a result, the gastroc can help the hamstring
    flex the knee only if the ankle is dorsiflexed (foot facing the
  body).
Now try to curl your leg and plantarflex your ankle (point the
    toe away from your body) at the same time. You should feel an
    extremely effective contraction in your hamstrings. 
So now we can see why our foot position really matters. When we
    have a plantarflexed foot, we increase the tension solely on the
    hamstrings since our gastroc has been, in effect, inactivated. This
    leads to two interesting hamstring training options.
First, we can alternate sets of leg curls with our ankle
    dorisflexed, with sets of leg curls with our ankle plantarflexed. 
This will have a wave loading heavier and lighter set effect.
    The first set of dorisflexion work will allow you to use greater
    total poundage, which is a big issue with underdeveloped hamstrings
    since they're just too weak in comparison to antagonistic
  quadriceps, which limits their development. 
It'll potentiate our central nervous system to allow our
    plantarflexed weaker set to maximally recruit all possible
    hamstring muscle fibers with a heavier than normal
  load.
Our second option is to perform concentric leg curls (bringing
    the lower legs towards the body) with our ankles dorsiflexed and a
    heavier than normal load. Since we're stronger eccentrically,
    we then drop our ankles into plantarflexion and lower the heavier
  weight with a slow eccentric tempo. 
This is a guaranteed hamstring plateau buster since we'll
    maximally stimulate the fast twitch fibers with the eccentric
  overload.
So what are you waiting for? Get to the gym and get those
    hamstrings growing.
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