Crunches can be a great addition to a well-rounded workout routine, but we spoke with Jacob Siwicki, founder and head coach of Siwicki Fitness, NCSF and AFAA certified, former top 1% globally ranked Equinox group fitness instructor (2019), Dartmouth economics graduate and former Dartmouth football player, fitness expert on FOX 5 DC, ranked #1 personal trainer in D.C. in 2021, who has a better solution. Press your lower back into the mat as you gradually lower your left arm and extend your right leg. Activate your core, legs, and glutes as you hold the position for the prescribed amount of time.