hi I started to do some training in December or so my chest flexibility is improving my trianing consists in on max static with full exale, I'm having problems feeling the pressure building up in my chest for I train with talbe for frc statics even 30 ssec.s is hard but after 2x 30 sec I can go beyond 1 min. easily I hit 1:25 after 3 sessions although I can pull an inhale static of 5 min. frc is kicking my butt but this train must really shine on the sea sessions