<div></div><div id="QUOTEHEAD">QUOTE</div><div id="QUOTE"> Leg curls are simple, they can't possibly hurt your back and are the perfect addition to squats in exercising the lower body.</div>
Tip:
Point toes away (plantarflexion) = less gastroc involvement.
Point toes towards/neutral (dorsiflexion) = more gastroc involvement.
You can vary the toe position in the middle of the rep. An example would be dorsiflexion for the concentric and then plantarflexion for the eccentric. This is sort of amounts to an accentuated eccentric for the hamstrings.
Leg curls work the short head of the biceps femoris in addition to the other 3 hamstrings. This is signifcant because the short head does not activate in hip extension (Good Mornings, Deadlifts of all kinds, Squats, Leg Presses). The reason is that it is "uniarticulate", originating on the femur and inserting into the tibia and fibula. According to Wikipedia sometimes people don't have a short head or sometimes have additional heads. If that blows your mind, 10% of the population has a third head in biceps brachii. Gray notes that occasional cadavers have had as many as 6. Talk about the proverbial Freak Of Nature/Genetic Marvel. But I digress... The Biceps Femoris Long Head is a poor knee flexor when the hips are extended (Read: Lying Leg Curl), so if you make leg curls a staple be sure to do them seated as well.
Glute-Ham raises are an undernoticed lift. The hamstrings must maintain the hip joint while flexing the knee. I have never gotten sore in my gastrocs from leg curls but I have from Glute-Ham Raises. There is a small research pool on the compartmentalization of muscle tissue. If it turns out that there are functional compartments in the gastroc then the G.H. Raise may be thought of as a calf exercise. At any rate, if you are into exploring the notion of Multiple Angle Training you cannot overlook the gastroc's dual role as plantarflexor AND knee flexor.
<div></div><div id="QUOTEHEAD">QUOTE</div><div id="QUOTE">Now SLDLs just look scary. The idea of keeping your knees straight when theres a weight pulling forward, its just gonna cause a whole host of problems in my view.
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I prefer not to lock my knees. Some time ago I read a good article written by a physical therapist who recommends SLDL's to his patients on a weekly basis for certain kinds of back pain. He does a few hundred pounds himself. When it comes to new lifts always start out light to minimize injuries due to bad form, new-at-this factor, etc. Make the goal of the first 2 sessions with a new lift to just learn and get the feel of the lift. I don't think its going to hurt you.
Combining leg curls with a hip extension movement like SLDL or GM's is a reasonable strategy. If SLDL's and GM's are not your thing (you must try them first!) then do leg presses with your feet at the top of the plate about 1/2 way off (go instinctive on this one). This is also hip extension. In fact, the ROM on this kind of leg press sort of compliments the ROM on SLDL/GM's. Your trouble with G.M.'s may stem from the arch/slouch in your back. When I started the Snatch Grip Deadlift I hadn't yet improved my posture. After 1 - 2 hrs when the DOMS would kick in I could pop the vertebrate in my middle back just by taking a deep breath. I suspect this was due to posture because now I cannot do it at all, even after a day in front of the computer.
<div></div><div id="QUOTEHEAD">QUOTE</div><div id="QUOTE">How long you been lifting altogether for?</div>
Since I was 12, maybe 13. I stopped for a while my last 1/2 of college then picked it up again in early '07. I'm almost 28 now. So....8-9 years maybe? Give or take a few months from injuries (head injury at 16, achilles tendonitis last year, etc..).
Olympic lifting is something I aim to study. I don't compete in it.
<div></div><div id="QUOTEHEAD">QUOTE</div><div id="QUOTE">Yes, I definitelly think so, mind you chins... does make your lats grow, because of the strectched position of the humerus....</div>
...I duuuuunno about this. Is it at the dead hang portion that the lats are more stretched with the chin?