Jennifer Lopez has sworn by during the pandemic to stay in tip-top shape. MORE: 15 best ladies bikes for 2021: Get inspired by cycle-loving celebritiesHer trainer, fitness and wellness guru David Kirsch, shared all of those details with Hello!, including the one thing you need post-workout to give you a boost. It's clear J.Lo's hard work in the gym paid offIf you take one look at the Hustlers star, it’s easy to see that her fitness routine is not for the faint of heart, but you can do this one