You could learn to take advantage of it Olympic style . Basically right out of the hole the knees cave in valgus is the term I think and then they jettison them the knees out with full force to completely the squat . Is it safe ? Idk . Am I a doctor ? No . is it taught and used successfully by the Chinese oly team ? Yes . <| sep |> Excel melts val so that ' s what ' s happening there . My Val STILL hasn ' t recovered 3 months later . I melted it to basically nothing before I changed things . My new sword had yellow leaves till I started dosing flourish and flourish trace so it ' s probably a nutrient deficiency . Not sure what exactly but it ' s not doing it anymore . However I added co 2 about a week after so could be co 2 .