DEAR ABBY: I’m average, fitness-wise, and work in an office. My girlfriend, who is naturally athletic, has belonged to a gym for a year. Our two fitness paths collided when I was enjoying a coffee with her and her training partner, “Trixi,” at her place one day. Trixi made a muscle. When I complimented her on her impressive arm definition, she responded I should see my girlfriend’s. When my girlfriend flexed, her bicep popped up so high my eyes bulged. Trixi then prodded me to flex. I didn’t want to because I knew my muscle wasn’t as developed. Trixi felt ...