A basic guideline for breathing properly while lifting includes...
(a) Inhaling your breath during the concentric phase and exhaling during the eccentric phase,
(b) Holding your breath throughout the lift,
(c) Holding your breath during the eccentric phase and exhaling during the concentric phase,
(d) Inhaling during the eccentric phase and exhaling your breath during the concentric phase,
(e) Inhaling during the eccentric phase and holding your breath during the concentric phase