It ruins your knees and it makes you sweat i might do it but dont let that fool you i do not really enjoy running i simply enjoy it more than being fatt shirt design reads i dont really enjoy runningour crew neck short sleeved mens t shirts are 100 premium cotton in a soft pre shrunk jersey knit our womens t shirts are lighter weight 150g tees made with deluxe 30s soft style yarns for a soft feel