if you have a slime block place it then go on it jump on it then just let yourself bounce a little you will false groundspoof and if you have a line of it going down straight and sprint and jump down it you will false speed heres a video of it https://streamable.com/5ke8r
if you have a slime block place it then go on it jump on it then just let yourself bounce a little you will false groundspoof and if you have a line of it going down straight and sprint and jump down it you will false speed heres a video of it https://streamable.com/5ke8r