The topic of how to best train for GS has been beaten to death, and there is still no conclusion. There is no answer, of course, no secret and no one correct way. Particular method used also depends on the athlete and his goals. It also depends on the availability of time, both for training and recovery. In any case, various training modalities are useful, and a lot can be extrapolated from other cyclical sports.
On Rostov GS site Rudnev has a page where you can ask a question, and I found one of the recent comments interesting.
Hello -----! In order to get the elbows to reach iliac bones it is necessary to work on the flexibility in thoracic spine and hip joints. I recommend to alternate interval work with continuous sets with the competition bells. For example: finish two week microcycle with 10 minute jerk set at 3 reps/min, next microcycle – 10 sets one minute each, with rest 1 minute at 10 jerks/minute. Let’s say that you managed to last 4 min 20 seconds at 3 reps/min, and managed 6 intervals. Repeat until 100% success. Next step will be to complete 10 minute set at 4 rep/min and to do 8 intervals 1 min 15 seconds each at the same tempo, with 1 min rest. In continuous sets we increase the tempo of lifting, while in interval training the duration of intervals increases while their number decreases. You can also do dosed standing (from 1 to 10 minutes) with the bells on the chest [static rack holds – Smet] with the bells 28 kg and heavier. During that you may walk around and do trunk twists.
Interesting, isn’t it? Interval training as described here is nothing other than Russian EDT. Long sets don’t need an explanation. It seems that the combination of the two can be beneficial in GS (just like in other cyclical sports where it has been used for decades). At least this is the opinion of Maestro Rudnev.