Core
2 guides
30-day challenge
30-Day Plank Challenge: Daily Hold Times, 20 s to 5 Min
A 30-day plank challenge with a daily hold-time table for beginners and an advanced track, form checks, and why counting seconds beats 'hold as long as you can'.
CoreHow Many Sit-Ups Should You Do a Day?
A daily sit-up number by level, how to split it, when planks or crunches are the better choice, and how to count core work so it adds up.