A fit teenager has taken on a tough running challenge during lockdown to help raise cash for frontline NHS staff.Generous Calvin Bogie, 19, decided he would do his bit to raise funds for Charities Together after his friend challenged him to complete a 5k run every day for three weeks. PAISLEY DAILY EXPRESS: Live news as it happens What started as a lighthearted joke among Calvin and his pals has now raised more than £1,400 for NHS staff.The trainee engineer, from Renfrew, is now almost two weeks into his challenge and says he is over the moon to have smashed his initial target of £1,000 in less than one week. Read More News: At the end of the three weeks he will have run a total of 105km.Calvin said: “I didn’t think for a second that I