First time I did them last week, my hams were sore for 4-5 days, I had to skip hams on legs day. This week, my hams are ok but my back is very sore. I'm sure it's because of deads because it never used to be sore whatever I tried.
I started very light then went up to around 90lbs on a small barbell, that's not too much is it? What's the general range of people's deads? I'm trying to use good form. At least I'm trying to keep my back straight throughout the movement and not move my knees forward. Is an alternate grip necessary?