Traditional planks can place undue stress on weight-bearing joints—try these chair exercises instead. If you’re in your 60s and want to give your core a solid strength workout, take a break from traditional floor planks and consider adding chair exercises to your routine. In this stable position, the emphasis is on engaging your core muscles without placing unnecessary pressure on your lower back, shoulders, or wrists. To help you get started, we learned four chair exercises from experts that will strengthen your core faster than floor planks after 60. Seated Marching or Knee Lifts“This exercise will help improve hip mobility, strengthen your hip flexors and lower abdominal muscles,” Nelson tells us.