Is your cardiopulmonary system fubar? You should not have so little stamina as you age. Lower aggregate strength and worse recovery time sure, but 3 measly miles on a bike shouldnt wear you out
I have had heart stuff checked and there was no problem. I just found I had almost no ability to build up more ability like I had before.
Start hitting the bike daily. Take protein and creative powder daily to improve recovery time and build muscle. You're probably getting too little exercise and not eating the amount of meat it takes to support those gains (no shade, you have to hork down steak at every meal to get enough protein for that).
When I was doing a full weight lifting routine, I might've been limited by protein intake. I tried consuming protein bars in the morning to fill in a protein intake hole. It didn't seem to make a difference. I've been a manager at a pizza place, so I consume lots of meat and cheese. I liked doing heavier weight lifting for strength increases. I tried doing lighter and longer, but I didn't seem to be getting anywhere with that. Maybe I approached it wrong. I was just toning down the heavier stuff and trying to go longer. More recently I tried really long and slow lifting with light weights. I started having nerve irritation in my arms, though.
I was doing heavier lifting for my body, because I'm naturally thin and weak (Buddy Holly or Screech from Saved by the Bell). I liked having something closer to normal male strength levels. I would bench press about 65 pounds to start right now and when I was 15 and had done no weight lifting, the 45 pound bar was too heavy for me. It might have been my arms that were too weak. I got where I was bench pressing 135 pounds (3x45) with about 8 reps. I went heavier than that, but I was hitting the reps and spending a lot of time under the bar.
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