I like pure negatives which i do now and again at home on my parallel bars(pure negatives only doing the negative phase) i find these good to do even on my own as i can raise myself in the upper position safely. ( bench press you need a partner). I also do these on chins. Static holds are more an isometric contraction and the way you do them is very hard lowering slowly also..intensity to say the least. I know this more as "Isometric stops" doing a set to failure then negative reps stopping at a third of the way down ,two third down and close to the bottom. at each of these positions along the range of motion you drive hard attempting to reverse the movement of the barbell or whatever for 3 seconds..your partner should prevent any upward movement by applying pressure to the bar, if necessary in each position. I also like super slow reps..