I don’t have access to a reverse leg press machine or a glute/ham raise machine…
other alternatives were I don’t need a machine?
VG
check out this link, most of chris’s hammy exercises dont require a specialized machine:
i dont have access to either but i still do my glute ham raises on the floor with my feet under the flat incline ab mat thing (adjustable)
looks like this:
hope that helps
Be careful with this exercise. When you’re doing it during the same period as you’re doing a lot of sprinting, it can be a bit much for the hamstring tendons.
Watch out for sore tendons behind the knee!
I would have the knee cap elevated from the floor 
Weighted back extensions is a pretty good hammie exercise as well, even though the erectors do get hit quite hard.