KONFIDANT1 on Twitter: "5 min plank workout. Plank the best exercise to work your abs stabilizer muscles (the muscles that keep your abs in) https://t.co/SSyxsJnnhD" / Twitter
30 Days to a 5 Minute Plank & Rock-Hard Abs | Physical Living | Health-First Fitness
5 Minute Plank Challenge | 30 day ab challenge, Ab challenge, 30 day abs